Type: supporting argument (off-timeline) · Assessment: contested — the Christological core (Christ's infinite merit) and the communion-of-saints premise (the members of the body share one another's goods) are strong and widely held; the specific high-medieval machinery — a quantifiable fund of the saints' surplus merit, drawn on by the power of the keys to remit temporal punishment — has no direct scriptural warrant, is a demonstrably late construction, and is denied at the root by the Reformers; no clear winner · advanced by Thomas Aquinas and Clement VI (Unigenitus, 1343).
Related arguments: surplus merit — see also Congruent and condign merit: do the justified truly merit their reward? · Are there works of supererogation? (precepts and the counsels of perfection)
“… how great a treasure did the good Father acquire from this for the Church militant … He willed to lay up a treasure for … His sons … so that thus there would be an infinite treasure to men … this treasure … through blessed Peter, the keeper of the keys of heaven, and his successors, his vicars on earth, He has committed to be dispensed for the good of the faithful … to which mass of treasure the merits of the Blessed Mother of God and of all the elect … are known to give their help.”
— Clement VI, bull Unigenitus Dei Filius (1343), Denzinger nos. 550–552. The assertion: Christ's passion is a superabundant satisfaction that constitutes an inexhaustible treasure (thesaurus meritorum), augmented by the surplus merits of Mary and the saints, entrusted to Peter's successors to be dispensed — by the power of the keys — for the remission of the temporal punishment of forgiven sin. (Not to be confused with Clement XI's anti-Jansenist bull of the same name, 1713.)
The idea has a scholastic pedigree before it has a papal one. The thirteenth-century schoolmen — Hugh of St-Cher (credited with the first developed statement of a thesaurus), Thomas Aquinas, and Bonaventure — worked the treasury out as a piece of the wider theology of satisfaction and merit; Clement VI then fixed it by papal authority in Unigenitus (1343), the charter to which the later theology of indulgences appeals. The Council of Trent retained it, and the modern Catechism restates it (§§1476–1479). The reading is thus the settled Roman Catholic dogma; the argument here weighs the interpretation, not merely one proponent's wording of it.
The Christological seed is unassailable. That the merit of Christ's passion is infinite and superabundant — more than sufficient to discharge every debt of every sinner — is common Christian teaching, not a Roman peculiarity. Aquinas puts the treasury on exactly this footing: “the cause of the remission of punishment effected by indulgences is no other than the abundance of the Church's merits, and this abundance suffices for the remission of all punishment”; “so great is the quantity of such merits that it exceeds the entire debt of punishment due to those who are living at this moment: and this is especially due to the merits of Christ.”1
The communion of saints supplies the sharing mechanism. If the members of Christ's body are one body, the good of one may profit another (Rom 12:5; 1 Cor 12:26; Col 1:24, “I fill up … that which is behind of the afflictions of Christ … for his body's sake, which is the church”). The treasury is, on its own account, just this good held in common: “those things which are the common property of a number are distributed to the various individuals according to the judgment of him who rules them all.”1 The modern Catechism makes the same move, defining the treasury as “the infinite value, which can never be exhausted, which Christ's merits have before God,” to which are joined “the prayers and good works of the Blessed Virgin Mary” and of “all the saints.”2
The power of the keys is the claimed licence to dispense. The proponents do not treat the dispensation as a bare assertion of power; they hang it on Christ's grant to Peter, “I will give unto thee the keys of the kingdom of heaven … whatsoever thou shalt bind on earth shall be bound in heaven” (Matt 16:19), extended to the apostles at Matt 18:18. Aquinas argues that after contrition removes guilt, “there remains an obligation to temporal punishment, which a man cannot by himself remove … therefore the keys are given, which diminish something of this punishment,” and that this binding-and-loosing “extends not only to the living, but also to the dead.”3 In the Summa he distinguishes the relevant key precisely: “The remission granted through indulgences is the effect of this key [of jurisdiction], since it does not belong to the dispensation of the sacraments, but to the distribution of the common property of the Church.”1 Clement VI closes the same circuit, committing the treasure to be dispensed “through blessed Peter, the keeper of the keys of heaven, and his successors.” Granted a treasury and granted the keys, the dispensation follows; the whole weight rests on those two prior grants.
What holds. The two premises the doctrine is built from are strong and, in isolation, uncontroversial: Christ's merit is infinite (denied by no orthodox party), and the body of Christ shares its goods (the communion of saints, confessed in the creed and voiced early — e.g. the confessors' libelli that let one Christian's suffering shorten another's penance, regulated by Cyprian c. 250). If those two premises entailed the treasury, the doctrine would be secure.
What is overstated or imprecise. Three joints bear more weight than the premises license.
(1) Practice preceded theory by centuries. The dispensing was in full swing — crusade indulgences from 1095, cash commutations from 1213 — before any treasury was defined; the doctrine of Unigenitus (1343) arrives to justify a practice already two-and-a-half centuries old. That order (practice first, doctrine after) is exactly what the indulgences timeline documents, and it weakens the claim that the treasury was read out of revelation rather than constructed to underwrite a going concern.
(2) The proof-texts are keys-texts, not treasury-texts. Matt 16:19 / 18:18 grant a power to bind and loose; they say nothing of a quantifiable fund of surplus merit, nor of transferring one person's excess merit to another, nor of applying it to the dead. Aquinas himself concedes the strain: the natural use of a key is “to open, not to bind,” and he must argue the reader into the extension to temporal punishment and to the dead against the plainer reading — an inference, not a datum of the text.3 The step from “the Church may forgive/retain sins” to “the Church banks and disburses a surplus of the saints' merit” is a theological construction laid over the keys, not the keys' own content.
(3) The surplus itself is contested at the root. The treasury presupposes that the saints did more than their salvation required — works of supererogation, whose banked surplus is the saints' contribution to the fund. Deny that (as Article XIV of the Thirty-Nine Articles does — such works “cannot be taught without arrogancy and impiety,” since “we are unprofitable servants”) and the saints' portion of the treasury collapses, leaving only Christ's merit — which needs no treasury-machinery to be applied. (Whether supererogation is possible is weighed on its own page and is the load-bearing sub-question here.)
The co-redemptive objection, and the reply. The sharpest Reformation charge is not that Christ's merit is finite but that the treasury supplements it, and so profanes it. Calvin puts it as a dilemma the doctrine cannot escape: the treasury is said to be formed when the martyrs' “blood is mingled with the blood of Christ, and out of both is formed the treasury of the Church, for the forgiveness and satisfaction of sins” — but “how could the blood of Christ be more foully profaned than when they deny that it is sufficient … unless the lack of it, as of something dried up and exhausted, be otherwise supplied and filled?” If Christ's merit truly suffices, the saints' merit is superfluous; if the saints' merit is needed, Christ's did not suffice.4 The Catholic reply, already implicit in Aquinas (“especially … the merits of Christ”) and explicit in the Catechism, is that the saints' merits are not an independent quantity added to a deficient stock but are themselves fruits of Christ's grace: the saints are those who “have followed in the footsteps of Christ … and by his grace have made their lives holy,” so their contribution presupposes and channels Christ's sufficiency rather than competing with it.2 This blunts the “co-redemptive” horn — the treasury is, on the Catholic account, one fund whose whole value is Christic — but it does not by itself answer objection (2): even granting the merits are all “of grace,” the transferable-surplus mechanism and its warrant in the keys remain the disputed points, and the reply concedes that the saints add nothing Christ's merit lacked (which is why the sharper Reformers ask what the saints' “surplus” is doing in the treasury at all).
Contested. The treasury of merit reads as strong within the system that produced it — it coheres with the theology of satisfaction, the communion of saints, and the power of the keys, and rests on the genuinely unassailable premise of Christ's infinite merit — and as weak from outside it, where its distinctive machinery (a banked, quantified, transferable surplus of the saints' merit, dispensed to remit temporal punishment and reach the dead) lacks any direct scriptural warrant, arrives late to justify an existing practice, and stands or falls with the separately contested doctrine of supererogation. The Christological core should be granted; the “co-redemptive” charge is answerable, since the Catholic account makes the saints' merits fruits of Christ's grace, not supplements to it. What remains genuinely disputed — and is not resolved by the reply — is the inferential leap from the keys to a dispensable treasury, and the surplus it presupposes. Strong by one discipline's lights, weak by another's, with no clear winner: contested.
Thomas Aquinas, Summa Theologiae, Supplement, Q. 25, art. 1–2 (on indulgences) — the remission “is no other than the abundance of the Church's merits … especially … the merits of Christ”; common property is distributed “according to the judgment of him who rules them all”; the remission “is the effect of this key [of jurisdiction] … the distribution of the common property of the Church.” See also his detail page on the purgatory timeline. ↩
Catechism of the Catholic Church §§1476–1479, vatican.va — the treasury is “the infinite value, which can never be exhausted, which Christ's merits have before God,” joined by the prayers and good works of the Blessed Virgin Mary and of all the saints who “by his grace have made their lives holy”; the indulgence opens it “by virtue of the power of binding and loosing granted her by Christ.” ↩
Thomas Aquinas, Commentary on Matthew 16:19, historicalchristian.faith — after contrition “there remains an obligation to temporal punishment, which a man cannot by himself remove … therefore the keys are given, which diminish something of this punishment”; the natural use of a key is “to open, not to bind”; and the binding/loosing “extends not only to the living, but also to the dead.” Cf. his comment on Matt 18:18 (the same power given to the whole Church, but universally to Peter). ↩
John Calvin, Institutes of the Christian Religion III.5.2–3 (1559), biblestudytools.com — the martyrs' “blood is mingled with the blood of Christ, and out of both is formed the treasury of the Church”; indulgences thus “profane” Christ's blood by denying “that it is sufficient … unless the lack of it … be otherwise supplied.” Cf. the Thirty-Nine Articles (1571), Article XIV, rejecting works of supererogation, treated on the treasury-of-merit timeline. ↩