Does the power of the keys (Matt 16:19 // 18:18) authorize the Church to remit the temporal punishment of sin?

Type: supporting argument (off-timeline) · Assessment: contested — that Christ gave a real, heaven-ratified power to “bind and loose” is unassailable and patristically universal; what is disputed is the scope. The ancient interpreters read binding/loosing as the remission or retention of sin (the sacrament of penance; John 20:23) and as church discipline (excommunication and reconciliation, the plain setting of Matt 18) — not as a power to remit the temporal punishment of already-forgiven sin, the indulgence proper. The extension to that is a later inference, and Aquinas himself, commenting on Matt 16:19, calls the temporal-punishment reading “not well said.” Strong as a grant of authority, genuinely disputed as a warrant for indulgences · advanced by Thomas Aquinas (Summa, Suppl. Q. 25), Clement VI, and the Council of Trent.

The claim

— Thomas Aquinas, reporting the reading of the keys applied to indulgences (here in his Commentary on Matthew 16:19, historicalchristian.faith). The claim is that Christ’s grant — “I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven” (Matthew 16:19), extended to the apostles at Matthew 18:18 — confers the authority the Church exercises in an indulgence: to remit, before God, the temporal penalty still owed for sin whose guilt is already forgiven.

Who advances it

The keys are the standing warrant appealed to whenever the Church’s power to grant indulgences is challenged. Aquinas gives it its scholastic form in the Summa (Supplement, Q. 25): the remission 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 in Unigenitus (1343), committing the treasure to be dispensed “through blessed Peter, the keeper of the keys of heaven, and his successors”; the Council of Trent (Session 25, 1563) affirms “that the power of conferring Indulgences was granted by Christ to the Church”; and the modern Catechism (§1478) says the indulgence is obtained “through the ministry of the Church which… intervenes in favor of individual Christians” by “the power of binding and loosing granted her by Christ.”² The argument here weighs the interpretation, not one proponent’s wording of it.

The evidence for

The grant of authority is real and heaven-ratified. The fathers do not treat “whatsoever thou shalt bind… shall be bound in heaven” as a figure of speech. Chrysostom marvels that Christ entrusts “to a mortal man… the authority over all things in Heaven, giving him the keys,” a power “peculiar to God alone… to absolve sins.”³ If the Church truly holds a God-ratified power to loose the greater bond — the guilt and eternal penalty of sin — then (the argument runs) it may a fortiori loose the lesser, the temporal debt that remains after guilt is forgiven. Aquinas presses just this: since after contrition “there remains an obligation to temporal punishment, which a man cannot by himself remove… the keys are given, which diminish something of this punishment,” and the power “extends not only to the living, but also to the dead.”⁴ Granted a remaining temporal debt and a treasury from which to draw, the keys furnish the licence to apply it.

Adversarial assessment

What holds. That Christ conferred a genuine authority to bind and loose — ratified in heaven, not a bare human declaration — is common ground, affirmed by the whole tradition and not in dispute here. The Church really does hold the power to remit and retain sin and to admit to or exclude from communion. Trent’s affirmation that this power was “granted by Christ to the Church” is, at the level of the grant itself, well founded.

What is overstated. The dispute is not the grant but its scope, and here the proof-text is thinner than the doctrine it is asked to carry.

(1) The tradition reads the keys of sin and discipline, not of temporal punishment. Where the fathers specify what is bound and loosed, they name the forgiveness or retention of sin and the discipline of the offender, never the temporal debt of an already-forgiven sin. Theophylact glosses the keys as “that which binds or looses transgressions, namely, penance or absolution,” tying them to John 20:23 (“Whose soever sins ye remit”). Jerome reads the priest as discerning and declaring who is bound or loosed — the leper shown to the priest — and sharply warns bishops against arrogating “something of the… Pharisees… to condemn the innocent or… release the guilty.”⁵ And the setting of Matt 18:18 is unmistakably church discipline: “if he will not hear the church, let him be… as a heathen” — so Chrysostom, Augustine and Theophylact read binding as holding the unrepentant as an outsider and loosing as reconciling him.⁶ Nothing in either text speaks of a temporal penalty surviving forgiveness.

(2) The chief proponent hedges on the very inference. In his Commentary on Matthew 16:19 Aquinas reports the reading that “the keys are given, which diminish something of this [temporal] punishment” and then explicitly demurs: “it seems to me that this is not well said, because the sacrament of the new law gives grace, but grace is not directed against punishment, but against guilt.” There he grounds the key in the remission of guilt, like baptism.⁴ His Summa uses the keys for temporal punishment; his Gospel commentary backs away from it. That a defender of the doctrine is divided against himself on the exegesis is a fair measure of how much of the reading is inference rather than the text’s own content.

(3) The reading rests on prior premises the keys do not supply. For the keys to authorize an indulgence one must first grant (a) that a temporal debt survives the forgiveness of guilt, and (b) that a treasury of merit exists from which to remit it — both weighed, and both contested or weak, on their own pages. The keys give the Church authority; they do not by themselves establish the object (a temporal penalty) or the means (a banked surplus) on which that authority is here exercised. As the treasury page puts it, Matt 16:19 / 18:18 are keys-texts, not treasury-texts; the same is true of temporal punishment.

Assessment

Contested. The underlying grant — a real, heaven-ratified power to bind and loose — is secure and universally held, and Trent’s claim that the power to grant indulgences was “granted by Christ to the Church” rests on it. But the specific reading the indulgence needs — that this power reaches to remitting the temporal punishment of already-forgiven sin, and to the dead — is an inference laid over texts the tradition read of the forgiveness of sin and of church discipline, and it borrows its object and means from the separately contested doctrines of a surviving temporal debt and a dispensable treasury. Even Aquinas, its ablest proponent, calls the temporal-punishment reading of the keys “not well said” in his Gospel commentary while deploying it in the Summa. Strong as a grant of authority, genuinely disputed as a warrant for indulgences, with no clear winner: contested.

Sources