Natural and Positive, Divine and Human

A discursive canon-law article on the classical taxonomy of law and its canonical reception: eternal law, natural law, divine positive law, and human law in Aquinas's treatise on law (ST I-II qq. 90-97), its sources in Isidore of Seville, its reception in Gratian's opening distinctions, the 1983 Code of Canon Law's working uses of the distinctions (divine law, merely ecclesiastical law, custom, dispensation), the Catechism's and Veritatis splendor's natural-law expositions, and the boundaries of what the Church claims to declare rather than constitute.

Two Canons and a Question

The Code of Canon Law never defines law. It opens by telling the reader which laws it means—“the canons of this Code regard only the Latin Church” (c. 1)—and then, ten canons later, it says something far stranger than a definition. Canon 11 reads, in the Latin that governs: Legibus mere ecclesiasticis tenentur baptizati in Ecclesia catholica vel in eandem recepti, quique sufficienti rationis usu gaudent et, nisi aliud iure expresse caveatur, septimum aetatis annum expleverunt—merely ecclesiastical laws bind those baptized in the Catholic Church or received into it, who have sufficient use of reason and, unless the law expressly provides otherwise, have completed their seventh year.¹

The strange word is mere—“merely.” A legislator who says that merely ecclesiastical laws bind only the baptized is conceding, in the act of legislating, that some of the law he administers is not merely his. And the rest of the Code keeps the concession. Canon 748 §1 asserts an obligation resting on all human beings, not on the baptized only, and names its source: all are bound to seek the truth in the things that regard God and his Church, and once they have come to know it, they are bound to embrace and keep it obligatione vi legis divinae—by the force of divine law.² Canon 1075 §1 reserves to the supreme authority of the Church the competence authentice declarare quandonam ius divinum matrimonium prohibeat vel dirimat—to declare authentically when divine law prohibits or invalidates marriage—and then, in §2, gives the same authority a different verb for a different thing: the right to constitute other impediments for the baptized.³ To declare is not to make; to constitute is. One canon, two verbs, and behind them an entire map of kinds of law that the Code uses on nearly every page and nowhere draws.

That map is the subject of this article. Its familiar labels are four: natural law and positive law, divine law and human law. Everyone who has spent an hour near canon law or Catholic moral theology has met them; almost no one has been shown where they come from, how they fit together, or what work they are actually doing when canon 24 §1 says that no custom contrary to divine law can obtain the force of law, or canon 85 defines dispensation as the relaxation of a merely ecclesiastical law, or canon 199 1° says that the rights and obligations of divine natural or positive law are not subject to prescription.⁴ The labels are not four boxes of equal shape. They are two distinctions that cut across each other unevenly, and the resulting scheme is asymmetric in ways that matter juridically: some of its categories the Church claims to legislate, amend, dispense, and abrogate; others it claims only to receive, declare, and guard. Mistake one for the other and you will misread both the Church’s modesty and her audacity—concluding either that everything in the Code is revisable policy, or that none of it is.

The article proceeds in what seemed the honest order. It begins where the working vocabulary actually entered the Latin canonical tradition: with Isidore of Seville’s seventh-century book On Laws, which handed a simplified Roman jurisprudence to the Middle Ages (section 2). It then works through the classical synthesis systematically: Thomas Aquinas’s treatise on law in the Summa theologiae, I-II questions 90 through 97, question by question, from the definition of law through eternal, natural, divine, and human law to the force of human law and its change (sections 3–5), and pauses to state exactly what the resulting taxonomy is and is not (section 6). It then turns to reception: Gratian’s opening distinctions, where the medieval Church’s own law book begins with this very map (section 7); the 1983 Code’s working uses of the categories, surveyed canon by canon (section 8); and the two institutes where the taxonomy ceases to be background and becomes operative machinery—custom (section 9) and dispensation (section 10). It closes with the modern magisterial exposition of natural law in the Catechism and Veritatis splendor (section 11), and with the boundaries: what the Church claims to declare rather than constitute, what the classical doctrine of unjust law does and does not license, and where the honest disputes now run (section 12).

Two warnings govern everything that follows. First, this is a study of texts at their own authority levels: a seventh-century encyclopedia, a thirteenth-century theological treatise, a twelfth-century schoolbook of canons, a promulgated code, a catechism, and an encyclical are not interchangeable authorities, and the article will say in each case what kind of claim its source can support. Second, the law cited as current is mutable law, verified against the Holy See’s published texts as of 25 July 2026 and governed by the Legal Scope and Currentness statement in the terminal appendix. Nothing here applies itself to any concrete case; that is what canonists, tribunals, and ordinaries are for.

The Inherited Vocabulary: Isidore’s Book on Laws

When the medieval canonists wanted definitions, they did not go first to the Roman jurists directly, and not yet to Aristotle. They went to a bishop of Seville who died in 636. Book V of Isidore’s Etymologies, De legibus et temporibus, is a compressed digest of late Roman jurisprudence—Isidore is transmitting, not inventing—and its opening chapters supplied the axioms from which both Gratian’s Decretum and Aquinas’s treatise on law visibly work.⁵ Four of those chapters carry almost the whole vocabulary this article traces.

Divine and human, fas and ius

The second chapter of Book V is a single breath: Omnes autem leges aut divinae sunt, aut humanae. Divinae natura, humanae moribus constant; ideoque haec discrepant, quoniam aliae aliis gentibus placent—all laws are either divine or human; divine laws stand by nature, human laws by usages, and that is why human laws diverge, since different things please different peoples. Then a pair of technical terms: Fas lex divina est, ius lex humana. Transire per alienum fas est, ius non est—fas is divine law, ius human law; to cross another’s land is fas, it is not ius.⁶

Everything the later tradition will complicate is already here in embryo, including the imprecision that will have to be repaired. Isidore’s “divine” law is what stands natura—by nature. The scheme has two members, and the divine member is simply the natural. Where in this scheme is the law God gave by speaking—the Decalogue, the Gospel precepts, the sacramental economy—which does not stand by nature and which no human legislator enacted? Isidore does not say; the first sentence of the book, naming Moses as the first to set forth divinas leges in writing, quietly assumes it. A taxonomy with a missing drawer is an invitation to successors, and both Gratian and Thomas accepted it in different ways.

Ius, lex, mos: written law and custom

Chapter three sorts the words themselves. Ius is the general name; lex is a species of it: Ius generale nomen est, lex autem iuris est species. And then the definition the Middle Ages memorized: Lex est constitutio scripta—law is a written enactment. Mos is vetustate probata consuetudo, sive lex non scripta—custom proved by long age, unwritten law; for lex takes its name from legere, to read, because it is written. Custom (consuetudo) is ius quoddam moribus institutum, quod pro lege suscipitur, cum deficit lex—a kind of law established by usages, which is taken for law where written law fails; nor does it matter whether it rests on writing or on reason, since reason commends law too.⁷

Three commitments in that chapter shaped a millennium of canon law. Written enactment is the paradigm of positive law but not its whole extent: custom is genuinely law, not tolerated fact. Custom’s title to be law is subsidiary—cum deficit lex, where enacted law fails. And the deepest criterion is neither writing nor age but reason. Canon 24 §2 of the present Code, requiring that a custom be rationabilis to obtain force of law, is this sentence of Isidore still working, fourteen centuries on (section 9).

Natural, civil, and the law of nations

Chapter four opens the tripartite division the Roman jurists had made famous: Ius autem naturale [est], aut civile, aut gentium—law is natural, or civil, or of nations. Natural law is commune omnium nationum, held everywhere instinctu naturae, non constitutione aliqua—by the prompting of nature, not by any enactment: the union of man and woman, the succession and rearing of children, the common possession of all things and the one liberty of all, the acquisition of what is taken from sky, land, and sea; the restitution of a thing deposited or money entrusted, the repelling of violence by force. Nam hoc, aut si quid huic simile est, numquam iniustum, sed naturale aequumque habetur—for this, and whatever resembles it, is never unjust, but is held to be natural and equitable.⁸ Civil law is what each people or city establishes as its own, humana divinaque causa; the law of nations—occupations of territory, war, captivity, treaties, embassies—is so called quia eo iure omnes fere gentes utuntur, because nearly all nations use it.⁹

The important thing for what follows is the fault line inside the scheme. “Natural” names a source (nature, not enactment); “civil” names an enactor (this people); “of nations” names an extent (nearly everyone). These are not parallel criteria, and the tradition had to decide which cut was fundamental. Aquinas’s answer—that the deep division is between what is derived from natural law as conclusion and what is derived as determination, with the ius gentium on one side of that line and civil law on the other—will occupy section 5.

What a law must be

Chapter twenty-one is a checklist, and it became the most quoted sentence of the book: Erit autem lex honesta, iusta, possibilis, secundum naturam, secundum consuetudinem patriae, loco temporique conveniens, necessaria, utilis, manifesta quoque, ne aliquid per obscuritatem in captionem contineat, nullo privato commodo, sed pro communi civium utilitate conscripta—law will be honorable, just, possible, according to nature, according to the custom of the country, suited to place and time, necessary, useful, manifest too—lest through obscurity it contain a trap—written for no private advantage, but for the common benefit of the citizens.¹⁰

Every phrase of that sentence had a career. Possibilis, secundum naturam, secundum consuetudinem patriae becomes Aquinas’s argument that human law must not try to forbid every vice (I-II q. 96 a. 2, quoting this very chapter). Pro communi utilitate civium conscripta becomes the “common good” clause of the scholastic definition of law. And the whole checklist, received through Gratian’s D.4, is the ancestor of the modern canonical instinct that a law failing these tests is a candidate for non-reception, desuetude, or emendation rather than reverence. Isidore wrote an encyclopedia entry; he turned out to have written the specification sheet against which the Latin Church still audits its own legislation.

One boundary should be stated before leaving him. Isidore carries no theory. There is no account here of why nature obliges, of how divine speech relates to natural instinct, of what happens when the categories conflict. The Etymologies is a filing cabinet, and its authority in what follows is the authority of a filing cabinet everyone used: it fixed the labels. The theory came six centuries later, and it is to that we now turn.

The Treatise on Law, I: What Law Is (ST I-II qq. 90–92)

The classical synthesis is a treatise of nineteen questions inside the Summa theologiae—the Prima Secundae, questions 90 through 108—of which the first eight (qq. 90–97) built the taxonomy this article traces. They are quoted here from an identified Latin witness (the Corpus Thomisticum web text, which presents the Leonine edition) with the English Dominican translation as working aid, and they repay being read in order, because the order is the argument: first what law is (q. 90), then what kinds there are (q. 91), then what law does (q. 92), and only then each kind in detail.¹¹

Question 90: the four-part definition

Aquinas assembles the definition of law in four articles, each contributing one clause, and the assembly discipline matters more than the famous result. Article 1: law belongs to reason. Lex quaedam regula est et mensura actuum … dicitur enim lex a ligando, quia obligat ad agendum—law is a rule and measure of acts, called lex from binding (ligare), because it obliges to act; and since the rule and measure of human acts is reason, relinquitur quod lex sit aliquid pertinens ad rationem.¹² An ordinance of will alone, however powerful, is on this account not yet law; a command is law only as an act of reason ordering means to an end.

Article 2: the end law regards is the common good. The last end of human life is happiness; one man is part of the perfect community; therefore necesse est quod lex proprie respiciat ordinem ad felicitatem communem—law properly regards the order to common happiness—and any precept about a particular matter has the character of law only as ordered to the common good.¹³ Article 3: the author. Ordering to the common good belongs to the whole multitude or to the one who has care of it: condere legem vel pertinet ad totam multitudinem, vel pertinet ad personam publicam quae totius multitudinis curam habet. A private person can advise; he cannot legislate, because he lacks the coercive power law requires.¹⁴ Article 4: promulgation. A rule measures only what it is applied to; application to persons is made per hoc quod in notitiam eorum deducitur ex ipsa promulgatione; therefore promulgation is necessary for law to have its force.

Then the assembled definition, in the exact words the tradition memorized: law is quaedam rationis ordinatio ad bonum commune, ab eo qui curam communitatis habet, promulgata—“an ordinance of reason for the common good, made by him who has care of the community, and promulgated.”¹⁵

The definition earns its keep in the objections it answers. If law must be promulgated, how is the natural law promulgated? The reply is one sentence with centuries inside it: promulgatio legis naturae est ex hoc ipso quod Deus eam mentibus hominum inseruit naturaliter cognoscendam—the natural law is promulgated by the very fact that God instilled it into human minds so as to be known naturally.¹⁶ Promulgation, that most positive-sounding of requirements, is satisfied for natural law by creation itself. Note what this move does to the taxonomy in advance: “positive” will not mean promulgated (all law is that); it will mean promulgated by an act in history rather than in the constitution of the creature.

Question 91: the kinds of law

Question 91 asks whether there is an eternal law, a natural law, a human law, a divine law—in that order, and the order is generative, each kind emerging from the one before.

Eternal law (a. 1). Law is a dictate of practical reason in a ruler governing a perfect community. Granted that the world is ruled by divine providence, tota communitas universi gubernatur ratione divina: the very plan (ratio) of the government of things in God as ruler of the universe has the character of law; and because the divine reason conceives nothing in time, huiusmodi legem oportet dicere aeternam—this law must be called eternal.¹⁷

Natural law (a. 2). Everything ruled by the eternal law participates in it, deriving from its impress the inclinations to proper acts and ends. Among creatures, the rational one participates in a higher mode—fit providentiae particeps, sibi ipsi et aliis providens, sharing in providence by being provident for itself and others. Then the sentence on which the whole edifice stands: talis participatio legis aeternae in rationali creatura lex naturalis dicitur—such participation of the eternal law in the rational creature is called the natural law; and the article closes by repeating it as a definition: lex naturalis nihil aliud est quam participatio legis aeternae in rationali creatura.¹⁸ Natural law, in this synthesis, is not a second statute book beside God’s; it is the eternal law itself, present in the creature in the mode of rational inclination and natural knowledge.

Human law (a. 3). Practical reason proceeds as speculative reason does, from indemonstrable principles to conclusions. From the precepts of natural law quasi ex quibusdam principiis communibus et indemonstrabilibus, human reason must proceed ad aliqua magis particulariter disponenda: and these particular arrangements, devised by human reason and meeting the other conditions of law, dicuntur leges humanae.¹⁹ Human law is thus defined as derivative. Its dignity and its fallibility have the same source: it is reason working out, for this community, what the natural law leaves undetermined.

Divine law (a. 4)—meaning here what the later shorthand calls divine positive law, the law God gave by revelation. Why was it needed, if eternal law already reaches everything and natural law is its participation? Aquinas gives exactly four reasons, and their precision is the answer’s authority. First, man is ordained to an end exceeding his natural proportion—eternal beatitude—so a God-given law had to direct him beyond what natural and human law reach. Second, the uncertainty of human judgment, above all in contingent particulars, yields different and contrary laws; that man might know absque omni dubitatione what to do and avoid, a law that cannot err was needed. Third, human law can judge only exterior acts that appear, yet the perfection of virtue requires rectitude in interior acts too, which human law non potuit cohibere et ordinare sufficienter. Fourth—with Augustine—human law cannot punish or forbid all evils without destroying goods the common good needs; that no evil remain unforbidden and unpunished, divine law had to supervene, per quam omnia peccata prohibentur.²⁰

Old and New (a. 5). The divine law is one in author and end but distinguished as imperfect and perfect within one species, sicut puer et vir—as boy and man: the Old Law ordering to a sensible and earthly good, the New to an intelligible and heavenly one, on the Apostle’s own comparison of the pedagogue and the grown son.²¹ The point for the taxonomy is that “divine positive law” is not a monolith; it has an internal history, which is why the canonical tradition can hold that some Old-Law precepts bind still (as republished natural law), and others do not.

Question 92: what law does

The short question 92 completes the frame with law’s effects. The proper effect of law is bonos facere eos quibus datur—to make its subjects good, simply if the legislator intends the true common good secundum iustitiam divinam regulatum, only in a qualified sense if he intends something merely useful or pleasurable to himself or repugnant to divine justice: such a regime produces “good” subjects only as one speaks of a good thief.²² And the acts of law are four: praecipere … prohibere … permittere … punire—to command acts of virtue, forbid acts of vice, permit the indifferent, and punish through fear.²³

With the definition, the kinds, and the effects in hand, the treatise turns to each kind in detail. The next section follows it through the eternal and natural law; the one after, through human law, its force, and its change.

The Treatise on Law, II: Eternal and Natural Law (ST I-II qq. 93–94)

Question 93: the eternal law as measure of all law

Question 93 gives the eternal law its formal definition through the analogy of the craftsman. In every artificer there pre-exists the plan (ratio) of what his art will make; in every governor, the plan of the order to be carried out by the governed. God is both: creator, whose wisdom’s plan has the character of art or exemplar; and governor of every act and motion, whose wisdom’s plan, moventis omnia ad debitum finem, has the character of law. Hence: lex aeterna nihil aliud est quam ratio divinae sapientiae, secundum quod est directiva omnium actuum et motionum—the eternal law is nothing else than the plan of divine wisdom as directive of all acts and movements.²⁴

Article 3 draws the consequence that turns a theological thesis into a jurisprudence: whether every law is derived from the eternal law. In ordered movers, the power of the second mover derives from the first; in ordered governors, the plan of government descends from the chief—as the plan of what is to be done in a city flows from king to administrators, or from architect to craftsmen. Since the eternal law is the plan of government in the supreme governor, necesse est quod omnes rationes gubernationis quae sunt in inferioribus gubernantibus, a lege aeterna deriventur. And so, in words that decide in advance everything the treatise will say about unjust law: omnes leges, inquantum participant de ratione recta, intantum derivantur a lege aeterna—all laws, insofar as they partake of right reason, are to that extent derived from the eternal law; with Augustine, in temporal law nothing is just and lawful which men have not derived to themselves from the eternal law.²⁵

Two boundary-markers should be posted here, because popular usage blurs them. First, the eternal law is not “divine positive law writ large”; it is prior to the distinction between natural and revealed, and both are its participations—one through creation, one through history. Second, the eternal law is not available to us as a code we could consult; we reach it only in its participations. That is why the canonical tradition never cites “eternal law” as a working source of obligation the way it cites natural or divine positive law: the eternal law functions as the account of why the others oblige, not as a fifth text.

Question 94: the natural law in detail

Question 94 is the treatise’s most quoted question, and the article at its center (a. 2) repays exact reading, because what it actually says is more disciplined than what it is often made to say.

The first precept and the order of precepts (a. 2). The precepts of natural law stand to practical reason as the first principles of demonstration stand to speculative reason: both are per se nota, self-evident. As “being” is the first thing apprehended absolutely, so “good” is the first thing apprehended by practical reason, which is ordered to action: every agent acts for an end under the aspect of good. Therefore the first principle of practical reason is founded on the notion of good—bonum est quod omnia appetunt—and the first precept of law is: bonum est faciendum et prosequendum, et malum vitandum—good is to be done and pursued, and evil avoided. All other precepts of the natural law are founded on this, so that whatever practical reason naturally apprehends as human good belongs to its precepts. And because good has the nature of an end, secundum ordinem inclinationum naturalium, est ordo praeceptorum legis naturae: the order of the precepts follows the order of the natural inclinations—first what man shares with all substances (the conservation of his being), then what he shares with the animals (the union of male and female, the rearing of offspring), then what is proper to reason (to know the truth about God, to live in society).²⁶

Universality and its limits (a. 4). Is the natural law the same in all? As to the common first principles, est eadem apud omnes et secundum rectitudinem, et secundum notitiam—the same for all both in rectitude and in knowledge. As to the proper conclusions drawn from them, it is the same for all ut in pluribus—in the majority of cases—but can fail in particulars, both in rectitude (returning a deposit is right, but not to a man demanding weapons to attack the fatherland) and in knowledge, where passion, custom, or corrupt habit obscures the conclusion.²⁷

Immutability (a. 5). Can the natural law be changed? By way of addition, freely: many things useful to human life have been added over and above it, tam per legem divinam, quam etiam per leges humanas. By way of subtraction: as to first principles, lex naturae est omnino immutabilis—altogether unchangeable; as to secondary precepts, unchangeable ut in pluribus, though in some particular and rarer cases observance can be legitimately blocked.²⁸

Indelibility (a. 6). Can it be blotted out of the human heart? As to common principles, nullo modo potest a cordibus hominum deleri in universali—in no way, in the abstract; though it is blotted out in a particular action when passion hinders the application of principle to case. As to secondary precepts, it can be deleted from hearts—by evil persuasions, as errors occur even about necessary conclusions in speculative matters, or propter pravas consuetudines et habitus corruptos, by depraved customs and corrupt habits, as among those who did not reckon robbery, or vices against nature, to be sins.²⁹

What emerges from question 94 is a natural law with a definite architecture: a single self-evident first precept; primary precepts tracking the ordered natural inclinations; secondary precepts related to the primary as proximate conclusions; and, descending further, determinations that are no longer natural law at all but positive law built upon it. Everything in the canonical sections of this article—why divine law cannot be dispensed, why custom cannot prevail against it, why the Church claims to declare rather than make the impediments of natural law—presupposes precisely this architecture, and not a vaguer notion of “natural law” as whatever morality one takes to be obvious.

The Treatise on Law, III: Human Law, Its Force, and Its Change (ST I-II qq. 95–97)

Question 95: why human law exists and where it comes from

The necessity of enacted law (a. 1). Man has a natural aptitude for virtue, but its perfection requires training (disciplina). For the well-disposed young, paternal admonition suffices. But some are found protervi et ad vitia proni, unmoved by words, who must be restrained by force and fear—that ceasing from evil they might leave others in peace, and by habituation come at last to do willingly what they first did from dread. Huiusmodi autem disciplina cogens metu poenae, est disciplina legum. Unde necessarium fuit ad pacem hominum et virtutem, ut leges ponerentur—this discipline that compels through fear of punishment is the discipline of laws; whence for peace and virtue it was necessary that laws be enacted; for man armed with reason can serve his lusts as no beast can, and severed from law and justice he is the worst of animals.³⁰

Derivation: the treatise’s most important juridical distinction (a. 2). Is every human law derived from the natural law? The answer opens with Augustine—non videtur esse lex, quae iusta non fuerit, “that which is not just seems to be no law at all”—and states the principle: in human affairs a thing is just from being right according to the rule of reason; reason’s first rule is the natural law; therefore omnis lex humanitus posita intantum habet de ratione legis, inquantum a lege naturae derivatur. Si vero in aliquo, a lege naturali discordet, iam non erit lex sed legis corruptio—every humanly enacted law has just so much of the nature of law as it is derived from the law of nature; if in anything it is discordant from the natural law, it is no longer law but a corruption of law.³¹

Then the distinction on which canonical science still runs. Something can be derived from natural law in two ways: uno modo, sicut conclusiones ex principiis; alio modo, sicut determinationes quaedam aliquorum communium—as conclusions from principles, or as determinations of certain generalities. The first resembles demonstration: from “harm no one” one derives “do not kill” as a conclusion. The second resembles art: the builder determines the general form “house” to this shape; so the natural law has it that the evildoer be punished, but that he be punished with this penalty is a determination. Both are found in human law; but conclusions have force partly from the natural law itself, while determinations ex sola lege humana vigorem habent—have their force from human law alone.³²

Everything a canonist means by distinguishing what the Church could change from what she could not is an application of this pair. A law forbidding homicide restates natural law and no legislator can repeal the obligation, only the statute. A law setting seven years as the age of canonical majority-for-obligation (c. 11) is a determination: reason requires some threshold of discretion; nothing in nature fixes seven; the Church fixed it and can move it.

Isidore vindicated (a. 4). Asked whether Isidore’s division of human law is appropriate, Aquinas answers by finding its principle: a thing is divided essentially by what belongs to its notion. It belongs to the notion of human law to be derived from natural law—et secundum hoc dividitur ius positivum in ius gentium et ius civile, secundum duos modos quibus aliquid derivatur a lege naturae: to the ius gentium belong the conclusions—just buyings and sellings and the like, without which men cannot live together, since man is by nature a social animal; to the civil law, the particular determinations each city decides for itself.³³

Question 96: the force of human law

Question 96 is the treatise’s jurisprudence of limits, and its articles form a coherent doctrine of what enacted law may demand.

Not every vice (a. 2). Law is a rule and measure, and a measure must be homogeneous with the measured: laws must be imposed on men secundum eorum conditionem, according to their condition—Isidore’s possibilis, secundum naturam, secundum consuetudinem patriae quoted expressly. Human law is enacted for a multitude the greater part of which is not perfect in virtue. Et ideo lege humana non prohibentur omnia vitia, a quibus virtuosi abstinent; sed solum graviora, a quibus possibile est maiorem partem multitudinis abstinere; et praecipue quae sunt in nocumentum aliorum—human law does not forbid all vices from which the virtuous abstain, but only the graver ones from which the greater part can abstain, and chiefly those that harm others, without whose prohibition human society could not be preserved: homicide, theft, and the like.³⁴

Not every virtue, but no virtue excluded (a. 3). There is no virtue whose acts law cannot command—nulla virtus est de cuius actibus lex praecipere non possit—since every virtue’s objects can be referred to the common good; but human law commands only those acts ordinabiles ad bonum commune, immediately or through the good discipline that forms citizens to preserve justice and peace.³⁵

Conscience, and the two kinds of unjust law (a. 4). Do human laws bind in conscience? The article every polemicist quotes in half deserves quoting in whole. Just laws habent vim obligandi in foro conscientiae a lege aeterna, a qua derivantur—have binding force in the court of conscience from the eternal law from which they are derived; and laws are just from their end (the common good), their author (not exceeding his power), and their form (proportionate distribution of burdens). Unjust laws are of two kinds. Those contrary to human good—by end (the ruler’s own cupidity or vainglory), by author (beyond the power committed), or by form (unequal burdens even for the common good)—magis sunt violentiae quam leges, are acts of violence rather than laws, since with Augustine lex esse non videtur, quae iusta non fuerit; such laws do not bind in conscience—nisi forte propter vitandum scandalum vel turbationem, except perhaps to avoid scandal or disturbance, for which cause a man should yield even his right, on Matthew 5’s mile and cloak. But laws unjust by contrariety to the divine good—the laws of tyrants inducing to idolatry or to anything else against divine law—nullo modo licet observare: may in no way be observed, quia sicut dicitur Act. V, obedire oportet Deo magis quam hominibus—one must obey God rather than men.³⁶

Who is subject (a. 5). Whoever is subject to a power is subject to its law; exemption arises in two ways—by being simply outside the authority (the subjects of one kingdom are not bound by another’s laws), or secundum quod regitur superiori lege, insofar as one is ruled by a higher law, as the proconsul’s subject is not bound by his mandate where the emperor’s governs.³⁷

The letter, the intention, and the birth of dispensation (a. 6). May one subject to a law act beside its letter? Every law is ordered to the common weal and has the force of law to that extent. The legislator cannot foresee every case; he frames the law for what happens ut in pluribus. If a case emerges in which observance would damage the common welfare—the besieged city whose law keeps the gates closed, while the enemy pursues the very citizens who defend it—the law non est observanda: the gates are to be opened contra verba legis, ut servaretur utilitas communis, quam legislator intendit—against the words of the law, to preserve the common benefit the legislator intended. But with a discipline attached: where the danger is not sudden, it does not belong to just anyone to decide what serves the city—hoc solum pertinet ad principes, qui propter huiusmodi casus habent auctoritatem in legibus dispensandi, that belongs only to those in authority, who for such cases have the power of dispensing from the laws; where the peril is too sudden for recourse, ipsa necessitas dispensationem habet annexam, quia necessitas non subditur legi—necessity itself carries a dispensation with it, for necessity is not subject to law.³⁸

Question 97: change, and the force of custom

Why law rightly changes (a. 1). Human law is a dictate of reason directing human acts, and may justly change on two grounds: on the part of reason, because it is natural to human reason to advance gradually from the imperfect to the perfect—the first practical institutions, like the first philosophies, were imperfect and were corrected by successors; and on the part of men, whose changed conditions make different things expedient—with Augustine’s example of the people worthy to elect its magistrates that later, corrupted, deserves to lose the franchise.³⁹

Why it should not change easily (a. 2). Yet change has an intrinsic cost: ad observantiam legum plurimum valet consuetudo—custom avails greatly for the observance of laws, so much that whatever is done against common custom, though light in itself, seems grave. When law changes, its binding power is diminished insofar as custom is taken away. Therefore human law should never be changed nisi ex aliqua parte tantum recompensetur communi saluti, quantum ex ista parte derogatur—unless the common weal is compensated as much as it is harmed: by a very great and evident benefit, or by extreme necessity where the existing law contains manifest iniquity or its observance is very harmful.⁴⁰

Custom’s three powers (a. 3). Can custom obtain the force of law? All law proceeds from the reason and will of the lawgiver—divine and natural law from God’s reasonable will, human law from man’s will regulated by reason. But reason and will are manifested by deeds as well as words: hoc enim unusquisque eligere videtur ut bonum, quod opere implet—each man evidently chooses as good what he carries out in act. Hence by repeated acts, which make a custom, law can be changed and expounded, and something can even be established that has the force of law, inquantum per exteriores actus multiplicatos interior voluntatis motus, et rationis conceptus, efficacissime declaratur. The conclusion, in words canon 27 of the present Code still echoes: consuetudo et habet vim legis, et legem abolet, et est legum interpretatrix—custom has the force of law, abolishes law, and is the interpreter of laws.⁴¹

And the ceiling, stated in the same article’s first reply with a citation of Isidore: the natural and divine law proceed from the divine will, unde non potest mutari per consuetudinem procedentem a voluntate hominis … Et inde est quod nulla consuetudo vim obtinere potest contra legem divinam vel legem naturalem—no custom can obtain force against the divine law or the natural law; “let custom yield to authority.”⁴²

The treatise’s yield can now be gathered into a map—and the map, it turns out, is not symmetrical.

The Shape of the Taxonomy

Two distinctions, not four boxes

The familiar labels tempt the mind to a two-by-two grid: divine or human crossed with natural or positive, yielding four equal squares. The classical doctrine does not draw that grid, and seeing why is most of the payoff of the preceding three sections.

The divine/human distinction divides by author: whose reason and will does this law proceed from? The natural/positive distinction divides by mode of institution and promulgation: is this law given in the very constitution of the rational creature, knowable by the light of reason (promulgated, as q. 90 a. 4 ad 1 says, by God’s instilling it into human minds), or is it enacted by an act in history—spoken, written, promulgated to a community at a time?

Cross them honestly and the grid is asymmetric. Divine natural law exists: it is the natural law itself, whose author is God legislating through creation. Divine positive law exists: the Old and New Law, revealed in history. Human positive law exists: civil and ecclesiastical enactment and custom. But the fourth square—human natural law—is empty, and necessarily so: no human authority authors nature. What occupies the place people reach for when they say such things is human recognition, formulation, and determination of natural law—the conclusions and determinations of q. 95 a. 2—which are acts about the natural law, not a second natural law. And standing over the whole scheme, not inside it, is the eternal law: not a fifth species alongside the others but the divine wisdom of which natural law is the participation in rational creatures (q. 91 a. 2) and from which every true law, including human law, derives whatever binding force it has (q. 93 a. 3; q. 96 a. 4).⁴³

One more asymmetry matters juridically. Within human positive law, the Church’s tradition distinguishes law by which community’s care it serves: civil law, enacted by the civil community for temporal common good; and ecclesiastical law, enacted by the Church’s authority for the common good of the faithful ordered to salvation. The 1983 Code presupposes both, defers to civil law in defined matters (cc. 22, 1290), and calls its own purely human enactments leges mere ecclesiasticae—merely ecclesiastical laws (cc. 11, 85)—precisely to mark them off from the divine law, natural and positive, that the same Code also carries but did not author.

The taxonomy in one table

The table below states the scheme as the remainder of this article will use it. It is a summary of the sources already quoted, with the canonical consequences that sections 8–10 will verify canon by canon; the “exemplary loci” column names where each row’s claims are documented in this article.

Three consequences of the map, stated now and tested against the Code in what follows. First, the boundary of dispensation and custom is the boundary of authorship: what the Church did not author she cannot relax or watch lapse; what she authored she can. Second, the same written canon can carry more than one kind of law: a canon may restate divine law in one paragraph and determine it ecclesiastically in the next (c. 1075 is the textbook case), so the classification attaches to the norm carried, not to the ink. Third, “positive” is not a synonym for “arbitrary”: positive determinations bind in conscience when just, precisely because determination is one of the two modes of derivation from the natural law—though they bind, as q. 95 a. 2 says, with a force that is the enactment’s own.

Gratian’s Opening Distinctions

Between Isidore and Aquinas stands the book that made the taxonomy canonical in the strict sense: the Concordia discordantium canonum of the Bologna master Gratian, compiled around 1140, called simply the Decretum. It became the first volume of the Corpus iuris canonici, the schoolbook on which every canonist to 1917 was trained; and it opens—before popes, before councils, before a single disciplinary canon—with the taxonomy of law. The Church’s own lawbook begins by locating the Church’s law inside a scheme larger than the Church’s authority.⁴⁴

Distinction 1: two rules, and an equation

The first words of the first distinction are Gratian’s own dictum, and they say more than they seem to: Humanum genus duobus regitur, naturali uidelicet iure et moribus—the human race is ruled by two things, namely by natural law and by usages. Ius naturae est, quod in lege et euangelio continetur, quo quisque iubetur alii facere, quod sibi uult fieri, et prohibetur alii inferre, quod sibi nolit fieri—the law of nature is what is contained in the Law and the Gospel, by which each is commanded to do to another what he would have done to himself, and forbidden to inflict on another what he would not have inflicted on himself—sealed with Matthew 7:12: “this is the law and the prophets.”⁴⁵

Two moves happen in those two sentences. First, the whole of human governance is reduced to a pair: natural law and mores—custom and enactment together, the entire apparatus of positive law, gathered under “usages.” Second, and more consequentially, the natural law is identified by its content with revelation’s moral core: what nature teaches is “contained in the Law and the Gospel” and summarized by the golden rule. Gratian then reproduces Isidore’s chapters as his opening auctoritates—c. 1 giving the divine/human division verbatim (Diuinae natura, humanae moribus constant … Fas lex diuina est: ius lex humana), c. 7 the definition of ius naturale—and glosses them with a dictum that makes the compression explicit: from these words datur intelligi, in quo differant inter se lex diuina et humana, cum omne quod fas est, nomine diuinae uel naturalis legis accipiatur, nomine uero legis humanae mores iure conscripti et traditi intelligantur—everything that is fas is received under the name of divine or natural law; under the name of human law are understood usages written down and handed on as law.⁴⁶

Note what Gratian has not done: he has not distinguished natural law from divine positive law. Diuina uel naturalis lex is, for the opening distinctions, one block—exactly Isidore’s compression, now welded to Scripture. The scholastics would spend the next century taking that block apart (the canonists’ glosses on this very page of the Decretum enumerate multiple senses of ius naturale); Aquinas’s q. 91, with its separate articles for natural and divine law, is the mature repair. The 1983 Code, with its careful phrase legis divinae naturalis aut positivae (c. 199 1°), is the repair become statute. A reader who wants to know why the Code must say “divine law, natural or positive” is looking at the scar where Gratian’s equation was surgically divided.

Distinction 4: promulgation, and reception by use

Distinction 4 carries the Decretum’s doctrine of what makes an enactment a law. The dictum opening the distinction takes over Isidore’s purpose-clause: laws are instituted ut human audacity be checked and the capacity to harm restrained. Chapter 2 is Isidore’s checklist (Erit autem lex honesta, iusta, possibilis …) with Gratian’s pointed addendum: these things are to be weighed when law is being instituted, for once laws have been instituted, non erit liberum iudicare de ipsis, sed oportebit iudicare secundum ipsas—it will not be free to judge about them, but one will have to judge according to them.⁴⁷

Then, after Augustine’s chapter making the same point, the dictum the canonical tradition never forgot: Leges instituuntur, cum promulgantur, firmantur, cum moribus utentium approbantur—laws are instituted when they are promulgated; they are confirmed when they are approved by the usages of those who use them. As some laws have today been abrogated by the contrary usage of users, so laws are confirmed by users’ usage; whence the decree of Pope Telesphorus that clergy fast from Quinquagesima, never approved by use, does not convict those who do otherwise of transgression.⁴⁸

This is the taxonomy’s pastoral realism: positive law lives between two waters, authority above and reception below. Gratian will not let either swallow the other—promulgation institutes without use, but use can unmake what promulgation made.

Distinctions 8 and 9: the hierarchy stated as law

Distinction 8 opens by dividing what D.1 had joined: Differt etiam ius naturae a consuetudine et constitutione—the law of nature differs from custom and enactment. By the law of nature all things are common to all—as in the believers of Acts 4, and as the philosophers handed down (Plato’s city, “in which no one knows his own attachments”); by the law of custom or enactment, this is mine, that another’s.⁴⁹

And then Gratian states the hierarchy as flatly as it has ever been stated: Dignitate uero ius naturale simpliciter preualet consuetudini et constitutioni. Quecunque enim uel moribus recepta sunt, uel scriptis comprehensa, si naturali iuri fuerint aduersa, uana et irrita sunt habenda—in dignity the natural law simply prevails over custom and enactment: whatever has been received in usages or comprehended in writings, if it is adverse to natural law, is to be held vain and void.⁵⁰

Distinction 9 does the same for enactment: Quod autem constitutio naturali iuri cedat multiplici auctoritate probatur—that enactment yields to natural law is proved by manifold authority—and, after eleven chapters of Augustine, concludes: since by the natural law nothing is commanded but what God wills, and nothing forbidden but what God prohibits, and since the divine laws stand by nature, therefore whatever is shown contrary to the divine will, or to canonical Scripture, or to the divine laws, is also adverse to the natural law; Constitutiones ergo uel ecclesiasticae uel seculares, si naturali iuri contrariae probantur, penitus sunt excludendae—enactments, whether ecclesiastical or secular, if they are proved contrary to natural law, are to be entirely excluded.⁵¹

The architecture of the modern canons is now fully prefigured. That no custom contrary to divine law can obtain the force of law (c. 24 §1); that civil laws are received quatenus iuri divino non sint contrariae (cc. 22, 1290); that dispensation reaches merely ecclesiastical law and stops there (c. 85); that the canons which repeat the old law are to be weighed ratione etiam canonicae traditionis habita—with account taken of the canonical tradition (c. 6 §2)⁵²—all of it is Gratian’s opening distinctions, restated with a codifier’s economy. What the Decretum argued from authorities, the Code enacts as rules; and it is to the Code that we now turn.

The Living Taxonomy: The 1983 Code’s Working Uses

The Codex Iuris Canonici promulgated by John Paul II on 25 January 1983 by the apostolic constitution Sacrae disciplinae leges, in force from 27 November 1983 for the Latin Church, nowhere contains a treatise on the kinds of law.⁵³ It does something more instructive: it uses the taxonomy, constantly and precisely, as load-bearing structure. Tracing the usage is the most direct way to see that the classical map is current law and not a museum piece.

The positive-law lifecycle: promulgation, vacatio, abrogation

Before the Code deploys the taxonomy’s boundaries, it enacts the lifecycle of its own kind of law, and the opening canons of Book I are a compressed jurisprudence of positive law whose every clause has appeared earlier in this article. Canon 7: Lex instituitur cum promulgatur—a law is established when it is promulgated. Four words, and they are Gratian’s: the first clause of the D.4 dictum (Leges instituuntur, cum promulgantur; section 7), itself codifying q. 90 a. 4’s doctrine that promulgation is necessary for law to have its force.⁵⁴ Canon 8 supplies the determinations: universal ecclesiastical laws are promulgated by publication in the Acta Apostolicae Sedis and take force tantum expletis tribus mensibus from the date of the issue—after a three-month vacatio—unless the nature of the matter binds at once or the law itself sets a shorter or longer period; particular laws, in the manner the legislator determines, after a month.⁵⁵ Canon 9 adds non-retroactivity—Leges respiciunt futura, non praeterita, laws regard the future, not the past, unless they expressly provide for the past—and canons 20–21 govern death and doubt: a later law abrogates or derogates from an earlier one by express statement, direct contrariety, or complete reordering of the matter, but universal law does not derogate from particular or special law without express provision; and in doubt, revocation is not presumed—later laws are to be drawn into harmony with earlier ones quantum fieri potest.⁵⁶

The lifecycle canons never mention divine law, and that silence is their contribution to the map: institution by promulgation, vacatio, retroactivity, abrogation, and desuetude-by-custom are predicates of positive law only. Nothing in the natural law waits three months from an Acta date. The Code’s first pages thus perform the taxonomy before naming it: they legislate a complete grammar for the law the legislator makes, and then—in the canons this section now turns to—mark, with the word divino, everything that grammar cannot touch.

Merely ecclesiastical law: the Church naming her own

The phrase lex mere ecclesiastica appears at the two places where the Code must say exactly which of its norms are the legislator’s own artifacts: subjection (c. 11, quoted in section 1) and dispensation (c. 85, treated in section 10). The adverb does real work. A merely ecclesiastical law binds the baptized-or-received with sufficient reason from age seven—a triple determination (membership, discretion, threshold) of the natural-law principle that law binds those capable of receiving it. None of those three clauses could sensibly attach to divine law: the obligation of c. 748 §1 falls on omnes homines; no seventh birthday inaugurates the natural law. The Code’s restraint here is the taxonomy applied: the legislator states the reach of what he made, and only of what he made.⁵⁷

Divine law as boundary marker

A family of canons uses ius divinum to mark the outer wall of some human legal power—the points where enactment, custom, agreement, or lapse of time simply stop working.

Canonization of civil law. Canon 22: civil laws to which the Church’s law remits are to be observed in canon law with the same effects, quatenus iuri divino non sint contrariae et nisi aliud iure canonico caveatur—insofar as they are not contrary to divine law and unless canon law provides otherwise. Canon 1290 applies the same formula to the civil law of contracts; canon 98 §2 subjects minors to parental authority except where lege divina aut iure canonico they are exempt.⁵⁸

Custom. Canon 24 §1: Nulla consuetudo vim legis obtinere potest, quae sit iuri divino contraria—no custom which is contrary to divine law can obtain the force of law. Section 9 works through the whole institute; here the point is the wall itself, standing exactly where q. 97 a. 3 ad 1 and Gratian’s D.8 built it.

Prescription. Canon 199 1°: not subject to prescription—the acquisition or loss of rights by passage of time, itself a civil-law institute canonized with the divine-law proviso by c. 197—are iura et obligationes quae sunt legis divinae naturalis aut positivae—rights and obligations which are of divine natural or positive law.⁵⁹ Time, which erodes human titles, does not erode these.

Truth and faith. Canon 748 §1 grounds the universal obligation to seek and embrace religious truth vi legis divinae (section 1); its §2 immediately adds the other half of the conciliar teaching: it is never lawful to coerce anyone into embracing the faith against conscience. Canon 750 specifies what must be believed fide divina et catholica; canon 751 defines heresy as the obstinate denial or doubt alicuius veritatis divina et catholica credendae.⁶⁰

Divine institution: structures the Church says she received

A second family uses ex divina institutione or ordinatione divina not for norms but for structures—the things in the Church that the Church claims not to have made. The Catholic Church and the Apostolic See have the character of a moral person ex ipsa ordinatione divina (c. 113 §1). The power of governance exists in the Church ex divina institutione (c. 129 §1). An ecclesiastical office is constituted ordinatione sive divina sive ecclesiastica—the disjunction conceding that some offices (Petrine, episcopal) are received, others made (c. 145 §1). Among the faithful, ex divina institutione, there are sacred ministers (c. 207 §1); bishops succeed the apostles ex divina institutione (c. 375 §1); by the sacrament of orders, ex divina institutione, some of the faithful are constituted sacred ministers (c. 1008).⁶¹

The declare/constitute grammar of c. 1075 belongs to this family and is its sharpest instance, treated next.

Marriage: the taxonomy under load

Nowhere does the Code lean on the taxonomy harder than in marriage law, because nowhere else do divine natural law, divine positive law, ecclesiastical law, and civil law converge on a single institute.

Canon 1059 states the convergence: the marriage of Catholics, even if only one party is Catholic, regitur iure non solum divino, sed etiam canonico, salva competentia civilis potestatis circa mere civiles eiusdem matrimonii effectus—is governed not only by divine law but also by canon law, saving the competence of civil power over the merely civil effects.⁶²

Canon 1075 gives the two verbs (section 1): the supreme authority declares authentically when divine law prohibits or invalidates marriage (§1) and constitutes other impediments for the baptized (§2). The pair is not decorative; it drives operative differences elsewhere. Canon 1163 §2: a marriage invalid because of an impediment iuris naturalis aut divini positivi can be sanated solummodo postquam impedimentum cessavit—only after the impediment has ceased—whereas invalidity from merely ecclesiastical impediments or defect of form is sanable by the Church’s own act while she dispenses her own law.⁶³

The pattern deserves stating as a rule of reading: wherever the Code distinguishes what can be dispensed, sanated, or ceased-by-authority from what can only cease of itself, it is applying the authorship boundary. The Church heals defects in her own law by relaxing her own law; a divine-law impediment she can only outwait.

Penal law and penance: divine law with ecclesiastical teeth

The revised Book VI keeps the taxonomy at both ends. Canon 1315 §1: whoever has power to issue penal laws potest etiam legem divinam congrua poena munire—can also fortify a divine law with a fitting penalty. And the book’s final canon, 1399, permits punishment beyond the cases established by law only when divinae vel canonicae legis externa violatio is specially grave and scandal urgent—the pairing divine or canonical law marking, one last time, the two registers the Church’s courts can vindicate.⁶⁴ On the sacramental side, canon 1249 states that all the faithful ex lege divina are bound to do penance—and then, in the same breath, that penitential days and their observances are praescribuntur, prescribed by church law: the divine obligation is the Church’s warrant for determining fast and abstinence, and the determinations (cc. 1250–1253) are hers to make, delegate to conferences, and change.⁶⁵

An inventory of the Code’s taxonomy vocabulary

The table gathers the canons this article verified at the dated Latin and English deliveries, with the register each invokes. It is an inventory of verified instances, not an exhaustive concordance; a bounded literal search of all seven Latin book pages for the relevant vocabulary (recorded in the research records) located these and a remainder consisting mostly of cultus divinus (“divine worship”) usages, which belong to liturgical vocabulary, not to the taxonomy of law—a small object lesson in why word searches are not doctrine.⁶⁶

Read down the “function” column and the taxonomy’s canonical career is visible in miniature: it marks who is bound (c. 11), what cannot be received (cc. 22, 1290), what custom and time cannot touch (cc. 24, 199), what the Church received rather than made (cc. 113–1008), what she declares rather than constitutes (c. 1075), what she can heal and what she can only outwait (c. 1163), and what her courts may vindicate (cc. 1315, 1399). Two of its instruments, custom and dispensation, are systematic enough to deserve sections of their own.

Custom: Canons 23–28 Worked Through

Custom is where the taxonomy stops being a classroom diagram and becomes procedure, because custom is human positive law arising without enactment—the community’s repeated practice acquiring the force of law. Title II of Book I regulates it in six compact canons, and each canon is a decision about the map.⁶⁷

Canon 23—custom needs the legislator. Ea tantum consuetudo a communitate fidelium introducta vim legis habet, quae a legislatore approbata fuerit, ad normam canonum qui sequuntur—only that custom introduced by a community of the faithful which has been approved by the legislator has the force of law, according to the following canons. This is Aquinas’s ad 3 of q. 97 a. 3 made statute: in a community that cannot legislate for itself, custom obtains force through the legislator’s approval—here, ordinarily, the “legal” approval the following canons themselves grant in advance to customs meeting their conditions. The Code takes sides in an old debate: the consent of the community supplies the matter of custom; the authority of the legislator supplies its force.

Canon 24—the two walls. §1: Nulla consuetudo vim legis obtinere potest, quae sit iuri divino contraria. No custom against divine law, ever, of any age—the direct descendant of q. 97 a. 3 ad 1 and Gratian D.8’s uana et irrita. §2: nor can a custom contra aut praeter ius canonicum obtain force nisi sit rationabilis—unless it is reasonable—and a custom expressly reprobated in the law non est rationabilis.⁶⁸

Canon 25—the community and its intention. Nulla consuetudo vim legis obtinet, nisi a communitate legis saltem recipiendae capaci cum animo iuris inducendi servata fuerit—no custom obtains the force of law unless observed, with the intention of introducing law, by a community capable at least of receiving law. Two scholastic theses in one sentence: custom is not mere repetition but practice as claimed law (the exterior acts must declare, as q. 97 a. 3 puts it, an interior judgment of reason); and the practicing community must be one to which law can be given—a juridically organized people, not a crowd.

Canon 26—time as the measure of consent. Unless specially approved by the competent legislator, a custom vigenti iuri canonico contraria aut quae est praeter legem canonicam obtains force only when legitimately observed for thirty continuous and complete years; and against a canonical law containing a clause prohibiting future customs, only a centenary or immemorial custom can prevail.⁶⁹

Canon 27—the interpreter. Consuetudo est optima legum interpres—custom is the best interpreter of laws. Five words, unchanged in substance from the Roman jurists through Isidore’s mos-chapter and q. 97 a. 3’s legum interpretatrix: how a law has actually been lived by the community and tolerated by authority is the best evidence of what its words meant in practice.

Canon 28—how customs die. Firmo praescripto can. 5, consuetudo, sive contra sive praeter legem per contrariam consuetudinem aut legem revocatur; but—the sentence continues—unless the law makes express mention of them, it does not revoke centenary or immemorial customs, nec lex universalis consuetudines particulares—nor does universal law revoke particular customs.⁷⁰

The canon 5 preserved by that opening clause is the transitional settlement made once, at the Code’s entry into force, and it shows the same machinery running at full scale. Customs then in force contrary to the Code’s prescriptions and reprobated by its canons prorsus suppressae sunt, nec in posterum reviviscere sinantur—are utterly suppressed and not to be permitted to revive; other contrary customs are likewise held suppressed unless the Code expressly provides otherwise, or they are centenary or immemorial, in which case they tolerari possunt—can be tolerated—where in the ordinary’s judgment circumstances of places and persons make them impossible to remove. And customs praeter ius—beside the law, filling its silences—are simply preserved (§2).⁷¹

Standing back: the six canons are a complete miniature of the taxonomy’s mechanics. Divine law bounds the institute absolutely (c. 24 §1). Within human law, reason is the qualifying criterion (c. 24 §2), community and intention the material cause (c. 25), legislative consent—express, legal, or evidenced by time—the formal cause (cc. 23, 26), and ordinary legal succession the manner of death (c. 28). Gratian’s aphorism that laws are confirmed by the usages of those who use them survives, but disciplined: in the Code, usage no longer conditions the validity of promulgated law generally; it operates through this regulated institute—and through the sobering fact, which the tradition never denied, that a law wholly unreceived becomes in practice a dead letter whose formal abrogation waits on the legislator.⁷²

Dispensation and Its Limits: Canons 85–93

If custom is the community’s pressure on the law from below, dispensation is mercy’s pressure from above: the relaxation of a law, in a particular case, by the authority competent to relax it. Nothing in the Code displays the authorship boundary more cleanly, because the institute is defined by it.⁷³

The definition and its first wall

Canon 85: Dispensatio, seu legis mere ecclesiasticae in casu particulari relaxatio, concedi potest ab iis qui potestate gaudent exsecutiva intra limites suae competentiae, necnon ab illis quibus potestas dispensandi explicite vel implicite competit sive ipso iure sive vi legitimae delegationis—dispensation, that is, the relaxation of a merely ecclesiastical law in a particular case, can be granted by those with executive power within the limits of their competence, and by those to whom the power of dispensing belongs explicitly or implicitly, by the law itself or by legitimate delegation.

The definition does three things at once. It fixes the object: merely ecclesiastical law—divine law, natural or positive, is outside the institute by definition, not by a separate prohibition. It fixes the mode: relaxation in casu particulari—dispensation suspends the law’s obligation for this case while the law stands; it is neither abrogation (which kills the law) nor privilege (which grants a stable favor) nor permission built into the law itself. And it fixes the agents: executive power within competence—dispensing is governance of the law, not private equity.⁷⁴

The second wall: constitutive elements

Canon 86: Dispensationi obnoxiae non sunt leges quatenus ea definiunt, quae institutorum aut actuum iuridicorum essentialiter sunt constitutiva—laws are not subject to dispensation insofar as they define what is essentially constitutive of juridic institutes or acts. Even inside merely ecclesiastical law, there is a second boundary: where the law is not commanding but defining—saying what a parish, a novitiate, a valid election is—there is nothing to relax. One cannot be dispensed from the essence of a thing into still having the thing. The canon is the Code’s quiet homage to the difference between precept and definition, and it protects the legislator from himself: a dispensing authority that “relaxed” constitutive law would not be making an exception but unmaking an institute.⁷⁵

Who dispenses what: the distribution of mercy

Canons 87–89 distribute the power along the Church’s constitutional structure, and the distribution encodes the taxonomy a third time. The diocesan bishop can dispense the faithful, whenever he judges it conduces to their spiritual good, in legibus disciplinaribus tam universalibus quam particularibus pro suo territorio vel suis subditis a suprema Ecclesiae auctoritate latis—from universal and particular disciplinary laws issued by the supreme authority—but not from procedural or penal laws, nor from those whose dispensation is specially reserved to the Apostolic See (c. 87 §1); in urgent cases where recourse to Rome is difficult and grave harm threatens, even from reserved laws, if the Holy See is accustomed to dispense in the same circumstances (§2). The local ordinary dispenses from diocesan laws and, where it benefits the faithful, from the laws of plenary and provincial councils and of the episcopal conference (c. 88). Pastors and other presbyters or deacons dispense from universal or particular law only when the power has been expressly granted (c. 89).⁷⁶

Cause, validity, and interpretation

Canon 90 supplies the institute’s conscience: dispensation from ecclesiastical law is not to be given sine iusta et rationabili causa, habita ratione adiunctorum casus et gravitatis legis a qua dispensatur; otherwise the dispensation is illicit and—unless given by the legislator himself or his superior—also invalid (§1); in doubt about the sufficiency of the cause, it is granted validly and licitly (§2).⁷⁷

Set canon 90 beside canon 24 §2 and the two institutes reveal their common skeleton. Custom needs rationabilitas; dispensation needs a iusta et rationabilis causa. In both, human positive law bends—to long practice in one case, to particular hardship in the other—and in both, the bending is disciplined by reason and stopped absolutely at the divine-law wall. That is the classical doctrine of q. 95–97 turned into administrative machinery: positive determinations, because they are determinations, can flex; what they determine, because it was never enacted by man, cannot.

The machinery under load: marriage impediments, cc. 1078–1080

The dispensation title of Book I states the rules; the marriage impediment chapter of Book IV shows them running under the heaviest pastoral load in the system, and every joint in the machinery is a taxonomy decision. Canon 1078 §1: the local ordinary can dispense his own subjects anywhere and all persons actually present in his territory ab omnibus impedimentis iuris ecclesiastici—from all impediments of ecclesiastical law—except those reserved to the Apostolic See. The limiting genitive is the whole doctrine in three words: the general faculty reaches every impediment the Church made and no impediment she did not. §2 lists the reservations—the impediment arising from sacred orders or from a public perpetual vow of chastity in a pontifical religious institute, and the impediment of crime—both of them ecclesiastical constructions whose relaxation the supreme legislator keeps in his own hands. And §3 closes with a different kind of sentence altogether: Numquam datur dispensatio ab impedimento consanguinitatis in linea recta aut in secundo gradu lineae collateralis—dispensation is never given from the impediment of consanguinity in the direct line or in the second degree of the collateral line.⁷⁸

Canons 1079–1080 then flex everything flexible. In urgent danger of death, the local ordinary can dispense from the canonical form itself and from omnibus et singulis impedimentis iuris ecclesiastici, public or occult—except the impediment arising from the sacred order of presbyterate, reserved even then; where the ordinary cannot be reached, the pastor, the delegated sacred minister, and the assisting priest or deacon hold the same power, and the confessor holds it for occult impediments in the internal forum (c. 1079). When an impediment is discovered with everything ready for the wedding and delay would probably cause grave harm, the same powers revive outside danger of death, except for the reserved impediment of orders and vow (c. 1080).⁷⁹

Read as a set, cc. 1078–1080 are the taxonomy rendered as pastoral triage. Everything ecclesiastical bends, faster and lower as the need grows; what the Church holds herself unable to relax does not bend even at the deathbed, because inability, unlike reservation, is not a policy.

Declare, constitute, dispense: three verbs, one boundary

It is worth closing the survey by putting the Code’s three verbs side by side. Over divine law, the Church’s authority declares (c. 1075 §1: authentice declarare)—an act of authoritative recognition that changes our knowledge of the obligation, not the obligation. Over her own law, she constitutes (c. 1075 §2), and what she constitutes she can dispense (c. 85), because relaxation is just constitution’s mirror image. The three verbs are the entire taxonomy in operational form; a reader who keeps them straight can predict, before opening the commentary, which norms of the Code admit exception and which do not—and will understand why the declaration of a divine-law impediment binds even non-Catholics whom merely ecclesiastical impediments do not touch, a conclusion the canonical literature draws from precisely this grammar.⁸⁰

The Magisterial Exposition: Catechism and Veritatis splendor

The Code uses the taxonomy; two documents of the 1990s expound it. The Catechism of the Catholic Church (1992; Latin typical edition 1997) gives natural law its catechetical statement in seven paragraphs, and John Paul II’s encyclical Veritatis splendor (6 August 1993) gives it the fullest doctrinal treatment of the modern papal magisterium. Neither is legislation; both are teaching documents whose weight is that of the ordinary papal magisterium in their respective genres, and both, examined closely, teach the classical doctrine—participation, not intuitionism—with its scholastic architecture intact.⁸¹

CCC 1950–1953: the taxonomy in one paragraph

The article on the moral law opens, before reaching natural law, with a compact restatement of this entire study. Paragraph 1951 defines: Lex regula est agendi ab auctoritate competenti propter bonum commune promulgata—law is a rule of acting, promulgated by competent authority for the common good—the four clauses of q. 90 a. 4 in catechetical order; and grounds: Omnis lex in Lege aeterna suam primam et ultimam invenit veritatem—every law finds its first and ultimate truth in the eternal law—with Leo XIII’s Ordinatio rationis lex nominatur in the note. Then paragraph 1952 draws the map entire: the expressions of the moral law are diverse and all coherent among themselves—Lex aeterna, fons omnium legum in Deo; lex naturalis; Lex revelata Legem veterem Legemque continens novam seu evangelicam; tandem leges civiles et ecclesiasticae—the eternal law, source in God of all laws; the natural law; the revealed Law, comprising Old and New; and finally civil and ecclesiastical laws. Paragraph 1953 adds the Christological seal: the moral law finds its fullness and unity in Christ, who “is the end of the law” (Rom 10:4).⁸²

CCC 1954–1960: the catechetical seven

The Catechism’s exposition of natural law is built almost entirely out of citations, and the choice of citations is the teaching. 1954: man participates in the Creator’s wisdom and goodness; the natural law expresses “the original moral sense which enables man to discern by reason the good and the evil”—and the paragraph’s centerpiece is Leo XIII, Libertas praestantissimum: the natural law “is written and engraved in the soul of each and every man, because it is human reason ordaining him to do good and forbidding him to sin”; but this prescription of human reason “would not have the force of law if it were not the voice and interpreter of a higher reason to which our spirit and our freedom must be submitted.”⁸³

1955 names the law with a deliberately doubled adjective—“the ‘divine and natural’ law” (Lex divina et naturalis)—shows man the way; its principal precepts “are expressed in the Decalogue”; and it is called natural “not in reference to the nature of irrational beings, but because reason which decrees it properly belongs to human nature,” with Augustine (the eternal rules written “in the book of that light we call the truth,” impressed on the heart “like a seal on a ring that passes onto wax, without leaving the ring”) and Aquinas (natural law “nothing other than the light of understanding placed in us by God”) as the two witnesses.⁸⁴

1956–1958 give the three classical properties. Universality: present in the heart of each man and established by reason, binding all men, expressing the dignity of the person and determining “the basis for his fundamental rights and duties”—with Cicero’s De re publica as witness (“true law: right reason … diffused among all men … immutable and eternal”). Variability of application: “application of the natural law varies greatly”; it “can demand reflection that takes account of various conditions of life according to places, times, and circumstances”—yet in the diversity of cultures it “remains as a rule that binds men among themselves.” Immutability: “immutable and permanent throughout the variations of history”; even “when it is rejected in its very principles, it cannot be destroyed or removed from the heart of man,” with Augustine’s Confessions on the law “that iniquity itself does not efface.”⁸⁵

1959–1960 give the two juridical corollaries this article has been tracing all along. The natural law provides “the necessary basis for the civil law with which it is connected, whether by a reflection that draws conclusions from its principles, or by additions of a positive and juridical nature”—q. 95 a. 2’s conclusions and determinations, cited nearly verbatim in a universal catechism. And the limit of unaided nature: the precepts of natural law “are not perceived by everyone clearly and immediately”; sinful man needs grace and revelation so that moral and religious truths may be known “by everyone with facility, with firm certainty and with no admixture of error”—Pius XII’s formula from Humani generis, itself descended from q. 91 a. 4’s reasons for divine positive law.⁸⁶

Veritatis splendor 40–45: participated theonomy

The encyclical’s second chapter confronts the late-twentieth-century proposals directly, and its treatment of law (nn. 35–53) turns on a coined term. The occasion is the claim of “autonomous morality”: that human reason itself creates values and norms. The encyclical’s answer neither concedes autonomy nor retreats to heteronomy—law imposed as an alien will—but names a third thing.

n. 40 states both sides of the truth: the moral life calls for the creativity and originality of the person, yet “reason draws its own truth and authority from the eternal law, which is none other than divine wisdom itself.” There is a “rightful autonomy” of the practical reason: “man possesses in himself his own law, received from the Creator.” Nevertheless, “the autonomy of reason cannot mean that reason itself creates values and moral norms.”⁸⁷ n. 41 coins the term: a heteronomy that denied man’s self-determination would contradict revelation; what revelation actually teaches is “theonomy, or participated theonomy, since man’s free obedience to God’s law effectively implies that human reason and human will participate in God’s wisdom and providence.” Law is “an expression of divine wisdom: by submitting to the law, freedom submits to the truth of creation.”⁸⁸

nn. 42–43 re-derive the classical structure with the classical texts. Man’s freedom, “patterned on God’s freedom,” is not negated by obedience to divine law but only thereby “abides in the truth”; the discernment of good and evil happens “thanks to the light of natural reason, the reflection in man of the splendour of God’s countenance”—and n. 42 quotes, at length and by name, Aquinas’s Psalm-4 gloss from q. 91 a. 2, adding that the law is called natural “because the reason which promulgates it is proper to human nature.” n. 43 then quotes the Council—“the supreme rule of life is the divine law itself, the eternal, objective and universal law by which God out of his wisdom and love arranges, directs and governs the whole world and the paths of the human community”—identifies the doctrine as “the classic teaching on God’s eternal law,” cites Augustine’s definition and Thomas’s, and concludes: “the natural law enters here as the human expression of God’s eternal law,” quoting q. 91 a. 2’s participation formula entire.⁸⁹

n. 44 makes the reception explicit as history: “the Church has often made reference to the Thomistic doctrine of natural law, including it in her own teaching on morality,” and reproduces the whole Leonine passage the Catechism excerpts, through its conclusion: “the natural law is itself the eternal law, implanted in beings endowed with reason … it is none other than the eternal reason of the Creator and Ruler of the universe.” n. 45 completes the taxonomy from the top: the Church receives the New Law, “the ‘fulfilment’ of God’s law in Jesus Christ,” interior, “the law of the Spirit of life in Christ Jesus”; and—in the encyclical’s own summary of everything this article has mapped—“even if moral-theological reflection usually distinguishes between the positive or revealed law of God and the natural law, and, within the economy of salvation, between the ‘old’ and the ‘new’ law, it must not be forgotten that these and other useful distinctions always refer to that law whose author is the one and the same God and which is always meant for man.”⁹⁰

The magisterial exposition, then, adds no fifth category and subtracts none. What it adds is a defensive precision the thirteenth century did not need: against autonomy, that reason promulgates but does not author; against heteronomy, that the author’s law is not alien to the creature it constitutes; and against fragmentation, that the taxonomy’s distinctions—natural and positive, old and new—are distinctions within one legislator’s one wisdom. That last sentence of n. 45 is, in effect, the eternal law of q. 93 restated as a warning to people who would play the categories against each other.

Boundaries and Debates

An article that has spent eleven sections assembling a map owes the reader an honest statement of the map’s edges: what the Church actually claims for herself within it, what its most quoted sentence does not license, and where the live disagreements run.

What the Church claims: declaring without constituting

Gathered from the canons themselves, the Church’s claim over divine law has a precise shape. She claims to guard and transmit it (the deposit language of c. 750); to declare authentically where it binds (c. 1075 §1); to determine it ecclesiastically where it leaves room (cc. 1075 §2, 1249); to fortify it with penalties (c. 1315 §1); and to adjudicate its external violations (c. 1399). She claims neither to make it, nor to amend it, nor to dispense from it (c. 85 by definition; cc. 24 §1, 199 1°, 1163 §2 in application). This is a large claim and a modest one at once, and the two halves discipline each other. The claim to declare authentically is large: it means the Church asserts competence to say, with authority binding on consciences, where nature’s and revelation’s obligations lie—including for marriages of the unbaptized, whom her merely ecclesiastical laws do not touch. The refusal to constitute is the modesty that makes the large claim coherent: a Church that could make divine law could unmake it, and her insistence that she cannot is the strongest institutional evidence that she means the taxonomy seriously. The practical corollary runs through every prior section: when the Church changes fasting discipline, ages of majority, impediment lists, or penal procedure, she is exercising the authorship she claims; when she says she cannot change something—the matter of the sacraments, the indissolubility of ratified and consummated marriage, the moral core of the Decalogue—she is invoking the authorship she disclaims.⁹¹

What lex iniusta non est lex does not license

The tradition’s most quoted jurisprudential sentence—Augustine’s non videtur esse lex, quae iusta non fuerit, received in q. 95 a. 2 and q. 96 a. 4—is routinely deployed as if it made every citizen a court of final appeal against every law he judges unjust. The texts, read exactly, do something narrower and more interesting. In q. 95 a. 2 the sentence grounds a thesis about derivation: an enactment discordant from natural law is a legis corruptio, possessing whatever compliance it gets by force rather than by right. In q. 96 a. 4 it grounds a two-branch casuistry: laws unjust toward human good lack intrinsic binding force yet may still claim compliance propter vitandum scandalum vel turbationem—to avoid scandal or upheaval—for which a man should yield even his right; only laws contrary to the divine good (commanding idolatry, or anything against divine law) admit no obedience at all. Gratian’s parallel dicta (D.8–9) are likewise validity rules—uana et irrita, penitus excludendae—addressed to the legal system’s own organs about which norms to treat as law, not a charter of private resistance. The classical doctrine, in short, distinguishes three things the slogan fuses: the metaphysical status of the unjust enactment (corruption, not law simpliciter); the moral question of compliance (governed by prudence about scandal and common peace, except where obedience would itself be sin); and the systemic question of which organs may authoritatively treat an enactment as void. Modern Catholic teaching keeps the same three-fold discipline—and the present Code’s own instruments for contesting an ecclesiastical norm are administrative recourse and legislative emendation, not private nullification.⁹²

The contemporary debates, reported

Three live disputes touch the taxonomy directly. This article reports them; it does not adjudicate them, and the magisterium has not either.

New natural law theory versus classical readings. Beginning with Germain Grisez’s 1965 commentary on q. 94 a. 2 and elaborated by John Finnis (Natural Law and Natural Rights, 1980) and Joseph Boyle, the “new natural law” school holds that practical reason starts from a plurality of self-evident basic goods grasped underivatively, and that moral norms are generated by requirements of practical reasonableness—not derived from theoretical knowledge of human nature. Its critics on the classical side—Ralph McInerny, Russell Hittinger, Steven Long, and others writing from the Thomist commentatorial tradition—answer that this detaches q. 94 from its metaphysics: for Thomas, they argue, the precepts track natural inclinations as ordered by reason within a teleological anthropology, and a natural law without nature’s normativity collapses into constructivism. The dispute has real stakes for canonical and moral argument (how one argues from nature to norm, what “intrinsically evil” judgments rest on), and both schools claim the texts this article has quoted. The magisterium has canonized neither reading: Veritatis splendor teaches participation and rejects both autonomism and physicalism (nn. 46–48) without settling the school question.⁹³

The register of particular institutes. Within canon law, respectable authors dispute the classification of particular norms along the taxonomy’s seams: which marriage impediments are natural, which divine positive, which ecclesiastical (the Code itself lists without labeling, and c. 1075 presupposes the question can be authoritatively settled); how the dissolution of non-consummated and non-sacramental marriages coheres with indissolubility’s divine-law status; whether clerical continence obligations carry any divine-law component or are wholly ecclesiastical. These are disputes about where the boundary runs, conducted by all parties inside the shared map—which is itself evidence of the map’s authority.⁹⁴

Natural law in public argument. Outside the Church, the taxonomy’s natural-law member faces the standing objection that appeals to nature smuggle contested theology into civil argument. The classical answer is in the texts already quoted—the natural law is proposed precisely as what is knowable without revelation (CCC 1956’s pagan witness; q. 94’s epistemology of principles and conclusions)—joined to the concession the same texts make: that in the concrete human condition its conclusions are known “with facility, with firm certainty and with no admixture of error” only with help (CCC 1960). Whether that pairing persuades is a philosophical question beyond a canon-law article; that it is the Church’s stated position, rather than either naive rationalism or fideism, is a documentary question this article’s sources settle.

The claims and the record

Five statements one meets in popular writing about this subject can now be checked against the documents assembled above; each correction is bounded to the sources this article verified.

“Natural law means what is biologically natural, or what feels natural.” Not in these sources. The Catechism says expressly that the law is called natural “not in reference to the nature of irrational beings, but because reason which decrees it properly belongs to human nature” (CCC 1955), quoting the treatise’s own account (q. 91 a. 2; q. 94 a. 2): the inclinations enter the law only as apprehended and ordered by reason. An argument from bare biology or bare feeling to obligation is not the classical doctrine but one of its recurring counterfeits—Veritatis splendor rejects the biologistic reading under the name of “physicalism” in the same chapter that rejects autonomism.

“The Church claims she can dispense from anything.” The opposite is enacted: dispensation is by definition the relaxation of a merely ecclesiastical law (c. 85); the Code provides no organ, procedure, or emergency under which divine law is dispensed—the deathbed faculties of cc. 1079–1080 relax the Church’s form and the Church’s impediments and stop exactly there.

“Canon law simply declares natural law; it is all divine, so none of it can change.” The Code itself refuses the flattery. It names its own artifacts leges mere ecclesiasticae (cc. 11, 85), gives them a complete lifecycle of promulgation, vacatio, abrogation, and desuetude-by-custom (cc. 7–9, 20, 23–28), and distinguishes in one canon what its supreme authority declares from what it constitutes (c. 1075). Most of the Code is determination, and determination is revisable by its author.

“Unjust laws are not laws, so each person judges which laws bind.” The sources quoted in sections 5 and 7 say something narrower: the discordant enactment lacks the nature of law (q. 95 a. 2), but compliance is governed by a separate prudential doctrine in which scandal and common peace can oblige yielding even one’s right, and only commands contrary to the divine good exclude obedience absolutely (q. 96 a. 4); outside sudden necessity, judging the case belongs to authority, not to quilibet (q. 96 a. 6).

“The taxonomy is medieval scaffolding the modern Church quietly dropped.” Against this stands the documentary record of sections 8–11: a 1983 code that deploys the categories operatively in every book verified here; a 1992 catechism that lists them as one coherent scheme (CCC 1952); a 1993 encyclical that reaffirms the participation doctrine by name and at length (VS 40–45); and a 2021 penal reform that retains legem divinam and divinae vel canonicae legis in its working canons (cc. 1315, 1399). Whatever else may be said of the taxonomy, “dropped” is not it.⁹⁵

The question answered

Section 1 asked what map the Code was using when it said mere. The answer assembled since: a two-distinction, asymmetric taxonomy—author crossed with mode of institution—inherited from Roman jurisprudence through Isidore’s labels, given its theory by Aquinas’s treatise (participation of eternal law; conclusion and determination), made canonical by Gratian’s opening distinctions, and enacted as working structure in the 1983 Code, where it fixes who is bound, what custom and time cannot reach, what can be dispensed, and what can only be declared. The map’s enduring lesson is its asymmetry. The Church’s law is at once the most self-confident and the most self-limiting of legal systems: self-confident, because it claims to carry obligations older and larger than itself; self-limiting, because it marks, in its own statute book, the exact line beyond which its legislator claims no power at all. Merely ecclesiastical is, on inspection, one of the more remarkable phrases a sovereign lawgiver has ever applied to his own enactments—and it is only intelligible on the map this article has tried to draw.

Scope, Method, and Qualifications

Reader, question, and method

This is a discursive canon-law article for a serious general reader able to follow documentary argument—secondarily for students of canon law, theology, or jurisprudence who need the classical taxonomy of law presented from its actual sources rather than from summaries. Its governing question: what is the classical taxonomy of law—eternal, natural, divine positive, human—where does it come from, and what work does it actually do in the current canon law of the Latin Church? Its claim, argued in epistemic order rather than announced: the taxonomy is not a four-box grid but two asymmetric distinctions (author; mode of institution) whose vocabulary the Latin tradition received from Roman jurisprudence through Isidore, whose theory is Aquinas’s treatise on law (natural law as participation of the eternal law; human law derived by conclusion and determination), whose canonical reception begins on the first page of Gratian’s Decretum, and whose working presence in the 1983 Code is pervasive and precise—fixing the subjects of merely ecclesiastical law (c. 11), the boundaries of custom (cc. 23–28) and dispensation (cc. 85–93), the exemptions from prescription (c. 199), the canonization of civil law (cc. 22, 1290), the structures held to be of divine institution, and the declare/constitute grammar of c. 1075; with the modern magisterial exposition (CCC 1954–1960; Veritatis splendor 40–45) teaching the same participation doctrine against autonomist and heteronomist alternatives.

The argument is governed by the repository’s articles profile, under both its faith-and-theology and its canon-law rules: exact body of law and edition identified per claim; promulgation and effective dates verified at the acts themselves; translation witnesses named; text distinguished from interpretation, validity from liceity, obligation from permission; and authority levels kept distinct throughout—a seventh-century encyclopedia, a twelfth-century school collection, a thirteenth-century theological treatise, a promulgated code, a catechism, and an encyclical are cited each as what it is. Project synthesis (the asymmetry formulation of section 6, the three-verb reading of section 10, the claims-audit of section 12) is labeled as such in the notes where it occurs.

Included and excluded scope

Included: the taxonomy’s sources and structure as documented in the named witnesses; its reception in Gratian’s opening distinctions and the 1983 Code; custom and dispensation as worked institutes; the CCC and Veritatis splendor expositions; the declare/constitute boundary; the classical doctrine of unjust law read exactly; the contemporary disputes at reported level.

Excluded: the Eastern Catholic churches—no CCEO analysis is performed, and nothing here may be applied to Eastern Catholics without one; the 1917 Code except at incidental reported level; Roman law at source (the Digest and Institutes stand behind Isidore but were not examined); the treatise on the Old and New Law (ST I-II qq. 98–108) beyond q. 91 a. 5; the philosophical literature on natural law outside the reported debates; civil-jurisdiction questions; particular and proper law; liturgical law; and every concrete case—no marriage, penalty, office, obligation, or conscience question of any person is analyzed or resolved here.

Material qualifications

1. All Vatican web texts are delivery states, not the Acta Apostolicae Sedis; two delivery defects were found and recorded (c. 11 English “efficient”; c. 1315 Latin divinamcongrua), and the possibility of others is not excluded.

2. The Summa is quoted from an electronic text identifying itself as Leonine, uncollated with print; the English translation is a working aid whose renderings occasionally smooth the Latin (noted where material).

3. Gratian is quoted from Friedberg’s vulgate text in the MDZ transcription; recension scholarship since Winroth is acknowledged and not engaged; wording differences between Gratian’s Isidore and Lindsay’s Isidore are transmission history, reported without resolution.

4. The canons inventory (section 8) is bounded by its stated search method; it is not a concordance, and register assignments in the “register invoked” column follow the canons’ own wording, with disputed classifications flagged as disputed.

5. The claim that the Code nowhere labels each impediment’s register, and the reading of cc. 1085, 1141–1150 questions as disputed territory, are carried at the level of the standard commentaries, which were consulted for orientation only.

6. The dating of Gratian (c. 1140) and all biographical framing are common scholarly background carried at reported level.

7. Doctrinal-authority questions (which declarations of divine law are definitive; the theological note of particular “divine institution” claims) are identified as further questions the taxonomy does not settle; nothing here assigns a theological note beyond what the quoted texts assign themselves.

8. The article’s synthesis claims—the empty fourth square, the three-verb grammar, the reading of dispensation and custom as authorship-bounded—are interpretations of the quoted sources, presented as the article’s own and traceable in the notes.

Legal Scope and Currentness

Governing law: the 1983 Codex Iuris Canonici, promulgated 25 January 1983 by Sacrae disciplinae leges and in force from 27 November 1983, as amended—including Book VI as integrally revised by Pascite gregem Dei (23 May 2021, in force 8 December 2021), whose promulgation facts were verified at the constitutions’ official texts. Authoritative language: Latin; the canons were verified at the Holy See’s Latin web deliveries (one page per book, fetched and hashed 2026-07-25), with the Holy See’s English web deliveries (translator unnamed) as identified working translations; where they diverge, the Latin governs and divergences are reported. Jurisdiction and persons: the Latin Church only (c. 1); no CCEO norm is analyzed, and Latin conclusions must not be transferred to Eastern Catholics. Universal law only: no particular, proper, liturgical, or penal-particular law is examined. Material facts assumed: none—the article analyzes norms in the abstract and determines no person’s obligations, status, or liability. Amendments: the canons quoted were checked at the current Vatican deliveries as of the as-of date; the article asserts currentness for the quoted canons as delivered, not a completed search of every amending act affecting other canons; known post-1983 amendments material to quoted canons (the 1998 Ad tuendam fidem changes to c. 750; the 2021 Book VI revision) are reflected in the texts used. As-of date: 25 July 2026. This is a study aid, not legal or canonical advice; rights, penalties, marriage status, sacramental access, office, and every concrete application belong to the competent ecclesiastical authority or a qualified canonist with the complete facts.

Notes, translations, rights, and review

The numbered Notes carry exact citations, verification dates, evidentiary ceilings, and claim-local qualifications; no indispensable premise lives only in a note. Latin is quoted where the original governs, with English renderings either quoted from the identified translations or supplied as labeled working glosses. Official Holy See texts, the Corpus Thomisticum and New Advent presentations, and the MDZ Gratian transcription are quoted briefly with attribution from registered dated states and remain outside the project’s CC BY 4.0 grant; the retained Isidore page images are reproductions of a public-domain 1911 printing; project-created prose and organization are project content. All online witnesses were fetched, hashed, and read publication-locally on 2026-07-25; source-library records (dated web states, artifacts with hashes, registered passages, and three retained public-domain page images) were created or bound for this article, with publication bindings in this leaf’s research records.

This revision received internal argumentative, source-consistency, quotation, rights, and production review by the authoring agent. Independent review—philosophical, historical, theological, and canonical—is outstanding; no imprimatur, nihil obstat, or ecclesiastical approval is claimed, and internal checking is not independent review. The publication language for this work is: source-audited working article.

References

All web sources were fetched over HTTPS, hashed (SHA-256), and read on 2026-07-25; the exact response hashes and the retained artifacts are recorded in the repository’s source library and this leaf’s research/ records. Official texts remain under their own rights.

Law

• Codex Iuris Canonici (1983), Latin: Holy See web deliveries, one page per book, https://www.vatican.va/archive/cod-iuris-canonici/latin/documents/cic_liberI_la.html through cic_liberVII_la.html. English: Holy See web deliveries by canon range under https://www.vatican.va/archive/cod-iuris-canonici/eng/documents/. Canons quoted: 1, 6, 11, 17, 19, 22, 23–28, 85–93, 98, 113, 129, 145, 199, 207, 375, 748, 750, 751, 1008, 1059, 1075, 1084, 1163, 1165, 1249, 1290, 1315, 1399.

• John Paul II, apostolic constitution Sacrae disciplinae leges (25 January 1983), English: https://www.vatican.va/content/john-paul-ii/en/apost_constitutions/documents/hf_jp-ii_apc_25011983_sacrae-disciplinae-leges.html.

• Francis, apostolic constitution Pascite gregem Dei (23 May 2021), English: https://www.vatican.va/content/francesco/en/apost_constitutions/documents/papa-francesco_costituzione-ap_20210523_pascite-gregem-dei.html.

Classical sources

• Isidore of Seville, Etymologiarum sive Originum libri XX, ed. W. M. Lindsay, vol. 1 (Oxford: Clarendon Press, 1911); scan of the University of Toronto exemplar, Internet Archive item isidori01isiduoft; Book V chapters ii–vi and xxi read at retained page images (leaves 192, 193, 196), IIIF service https://iiif.archive.org/iiif/.

• Gratian, Decretum (Concordia discordantium canonum), Distinctions 1, 4, 8, 9, in the text of Aemilius Friedberg, Corpus iuris canonici, editio Lipsiensis secunda, vol. 1 (Leipzig: Tauchnitz, 1879), as transcribed by the Münchener DigitalisierungsZentrum online edition, https://geschichte.digitale-sammlungen.de/decretum-gratiani/.

• Thomas Aquinas, Summa theologiae I-II qq. 90–97. Latin: Corpus Thomisticum (site presents the Leonine text), pages sth2090, sth2093, sth2094, and sth2095 under https://www.corpusthomisticum.org/. English: Fathers of the English Dominican Province translation, New Advent, pages 2090.htm through 2097.htm under https://www.newadvent.org/summa/.

Magisterial teaching

• Catechism of the Catholic Church 1954–1960. English: https://www.vatican.va/content/catechism/en/part_three/section_one/chapter_three/article_1/i_the_natural_moral_law.html; Latin (typical-edition text): https://www.vatican.va/archive/catechism_lt/p3s1c3a1_lt.htm.

• John Paul II, encyclical Veritatis splendor (6 August 1993), nn. 12, 40–45, English: https://www.vatican.va/content/john-paul-ii/en/encyclicals/documents/hf_jp-ii_enc_06081993_veritatis-splendor.html; Latin text AAS 85 (1993) 1133–1228 (not collated).

• Second Vatican Council, declaration Dignitatis humanae (7 December 1965), n. 3, English: https://www.vatican.va/archive/hist_councils/ii_vatican_council/documents/vat-ii_decl_19651207_dignitatis-humanae_en.html.

Reported literature (not consulted at source)

• G. Grisez, “The First Principle of Practical Reason: A Commentary on the Summa theologiae, 1-2, Question 94, Article 2,” Natural Law Forum 10 (1965) 168–201; J. Finnis, Natural Law and Natural Rights (Oxford: Clarendon Press, 1980); R. Hittinger, A Critique of the New Natural Law Theory (Notre Dame, 1987); R. McInerny, Aquinas on Human Action (Washington, 1992). Cited only as the named positions in the reported debate of section 12.

Last revised (UTC): 2026-07-25T09:42:30Z

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