To see what is at stake, picture the image most often used to teach the doctrine: the soul as a heap of refuse, and the righteousness of Christ as fresh snow fallen over it. The snow is real, white, and from heaven; the heap beneath is unchanged. God, looking down, sees only the snow. This picture — popularly, and wrongly, attributed to Luther himself, though no such line has ever been found in his works — nonetheless captures faithfully what strict imputation means: the believer is covered, not cleansed. His acceptance rests entirely on a righteousness that is and always remains another’s, lying outside him, credited to him but never infused into him.

This is not a caricature. It is the explicit teaching of the Reformed confessions, stated with great precision and care. And it must be engaged at its strongest, because the popular Catholic dismissal — “Protestants think God just pretends you’re holy” — misses how much real scriptural weight stands behind the doctrine, and how much of it the Catholic Church herself affirms. Let it be put, then, at full strength.

Begin where the doctrine is most vulnerable, because it is the one place where Paul states explicitly how the many come to be righteous — and sets it in deliberate parallel with how the many came to be sinners. “For as by the disobedience of one man, many were made sinners; so also by the obedience of one, many shall be made just” (Romans 5:19). The two verbs are not merely similar in English; in the Greek they are the same verb, kathistēmi, separated only by tense: katestathēsan, “were made,” for Adam’s accomplished ruin, and katastathēsontai, “shall be made,” for Christ’s coming work. And kathistēmi does not mean “to reckon” or “to declare a verdict.” It means to constitute, to appoint, to render, to make something so.

Now press the imputation reading. The Protestant insists that “made righteous” means “reckoned righteous while still unrighteous” — a status credited from outside. But Paul has bound that phrase, by the strictest grammatical parallel, to “made sinners.” Here the trained Reformed reader has an answer ready, and it must be met fairly: federal theology (Charles Hodge, John Murray) reads “made sinners” forensically too — Adam’s guilt imputed to his race by representation, exactly as Christ’s righteousness is imputed by representation. On that view the parallel is a parallel of two imputations, not two infusions, and the symmetry cuts the Protestant way.

But follow the federalist’s own doctrine, and it hands the case back. No Reformed theologian holds that Adam’s fall left our nature untouched — that we are merely reckoned fallen while remaining, in fact, innocent and whole. They confess inherited corruption: a real ruin in the nature, concupiscence no one chose, death reigning over all (Rom 5:14), so that Paul says the many “were made sinners” precisely because, as he writes, it is the one “in whom all have sinned” (Rom 5:12) — a fact in us, not only a verdict over us. Whatever element of imputed guilt attends Adam’s headship, it never stands alone; it arrives bearing a true interior consequence. And that is all the parallel requires. If “made sinners” delivers a real interior ruin and not a bare reckoning, then “made righteous” — the very same verb — delivers a real interior righteousness and not a bare reckoning. The one word cannot carry inherited reality on Adam’s side and pure fiction on Christ’s. Whatever depth the Fall worked in us, redemption works a greater (Rom 5:20). If sin reached the substance, so does grace.

The imputation scheme faces a difficulty that goes deeper than any single verse — a difficulty about the character of God. Scripture twice lays down a principle: God does not, and will not, call a thing what it is not. “Woe to you that call evil good, and good evil” (Isaiah 5:20). And, with chilling directness about the very act of justifying: “He that justifieth the wicked, and he that condemneth the just, both are abominable before God” (Proverbs 17:15). To justify the wicked — to pronounce “righteous” over a man who is in fact wicked — is named an abomination.

Yet Paul says God “justifieth the ungodly” (Romans 4:5). Here the Protestant reads triumph: the man is still ungodly when justified, therefore the righteousness must be external, reckoned, not his own. And the careful Reformed theologian has a real defense against the charge that this makes God the abominable judge of Proverbs 17:15. He does not, they answer, justify the wicked by ignoring guilt: the guilt was borne and paid by a substitute on the cross — justice satisfied, not bypassed — and what is then credited is Christ’s own real righteousness, no bare fiction. The verdict rests on an accomplished payment; it is not a lie.

That answer deserves its full weight — and it still does not reach the heart of the difficulty. Grant the satisfaction; grant that Christ’s righteousness is perfectly real in Christ. Proverbs does not ask whether a payment was made elsewhere; it asks what is true of the man the judge now calls righteous. If, at the very moment God pronounces him just, he remains in himself wholly unjust — the heap unchanged beneath the snow — then the word “righteous” still says of him something that is not yet so, and God’s justice is honored in the courtroom only at the price of the truth about the prisoner. To honor His own justice fully, the verdict and the man must somehow be made to meet.

There is only one way “God justifieth the ungodly” can be worthy of God — consistent with Isaiah and Proverbs — and it is the Catholic way. God justifies the ungodly by ceasing to leave him ungodly. He does not declare a lie over the sinner and avert His eyes from the filth beneath the snow; He reaches into the heap and transforms it, so that when He says “righteous,” the word is true because He has just made it true. The declaration of God is not a verdict that reports a reality holding elsewhere, in Christ’s separate account; it is a word that effects the reality it speaks. The God who said “Let there be light” and there was light does not pronounce men righteous and leave them wicked. His justifying word, like His creating word, does what it says.

If justification merely credited an external righteousness, Scripture would describe it in the language of accounting and covering. Instead, again and again, it describes it in the language of infusion — of something genuinely placed within the believer. “The charity of God is poured forth in our hearts, by the Holy Ghost, who is given to us” (Romans 5:5). One does not impute a poured thing; imputation has nothing to pour. Charity is not reckoned to an account in heaven; it is shed abroad in a human heart on earth. This is the very center of justification, and it is unmistakably interior.

The pattern holds across the New Testament. To the Corinthians, Paul lists justification not apart from inner cleansing but in the same breath with it: “but you are washed, but you are sanctified, but you are justified in the name of our Lord Jesus Christ” (1 Corinthians 6:11). Washing and sanctifying are real interior changes; Paul sets justification beside them as one cleansing event, not in a separate forensic register. To Titus he is more explicit still: God “saved us, by the laver of regeneration, and renovation of the Holy Ghost… that, being justified by his grace, we may be heirs” (Titus 3:5–7). Justification is grounded in regeneration and renovation — being born anew, being made new — not in a transfer of credit. And the destination of all this is staggering: that we “may be made partakers of the divine nature” (2 Peter 1:4). A snow-covered heap does not partake of the divine nature. Only a soul really transformed, really indwelt, really elevated by grace, can be said to share in the life of God. Even the faith that justifies is, in Paul’s own phrase, “faith that worketh by charity” (Galatians 5:6) — and charity is the poured gift, so that justifying faith itself is no bare assent but a living thing already shaped from within by the love of God infused. Saint John will not even let “righteous” float free of the man: “He that doth justice is just, even as he is just” (1 John 3:7) — and the standard is no legal minimum but God’s own holiness, “even as he is just,” a measure only an infused, living righteousness could ever approach.

The doctrine of imputation is not built on air; it rests on real texts, and honesty requires meeting them, not dodging them. Take the strongest, 2 Corinthians 5:21: “Him, who knew no sin, he hath made sin for us, that we might be made the justice of God in him.” The Protestant reads a perfect symmetry: as Christ’s being “made sin” was imputation (He stayed sinless), so our being “made” righteousness is imputation (we stay unrighteous). But notice the verb the Catholic gladly keeps: “that we might be made” — genōmetha, that we might become — a verb at least as naturally read as transformation as crediting. And, more tellingly, the symmetry the imputation reading needs is not as tight as it looks: Christ was “made sin” by bearing a penalty and a guilt foreign to His nature, for He had no sin of His own to be cleansed; but we are “made righteousness” by receiving a healing our nature desperately needs. The two halves of the exchange need not run in the same mode — and the half that touches us is the half Scripture says is poured within. The phrase “the justice of God” here means, as Augustine saw, not the justice by which God is Himself just, but “that with which He endows man when He justifies the ungodly” — a righteousness God works in us as gift. We do not merely have it credited; we “become” it.

Take Philippians 3:9: Paul desires to be found in Christ, “not having my justice, which is of the law, but that which is of the faith of Christ Jesus, which is of God, justice in faith.” The Protestant hears: not a righteousness in me, but one outside me in Christ. But that is not Paul’s contrast. He opposes a righteousness “of my own” — self-generated, law-wrought, the proud achievement of the Pharisee he had been — to a righteousness “of God,” received as gift through faith. Infused righteousness fits this exactly: it is genuinely in Paul, yet emphatically not his own, because it is God’s grace at work in him, not his own effort putting God in his debt. “Not my own” rules out self-righteousness; it does not rule out interior renewal. A gift truly given to me, and now truly mine by God’s giving, is still never “my own” in the sense Paul disowns.

And take the engine room, Romans 4 with its Psalm: “Blessed are they whose iniquities are forgiven, and whose sins are covered. Blessed is the man to whom the Lord hath not imputed sin” (Rom 4:7–8; Ps 31:1–2). The Protestant treats “not imputing sin” as proof that sin remains but is overlooked. But read the parallel lines as Hebrew poetry demands: iniquities forgiven, sins covered, sin not imputed — three ways of saying one thing, that guilt is genuinely taken away, not merely ignored while it festers. To “cover” sin in this idiom is to blot it out, as God promised to do. The Council of Trent grasped both halves at once: justification is the remission of sins and the infusion of grace and charity — the negative side (guilt truly removed) and the positive side (righteousness truly given), two faces of one act of God. Even Abraham, the Protestant’s prize witness, will not stay in the ledger: the same verse that says his faith was “reputed to justice” (Gen 15:6) is quoted by Saint James of the day, decades later, when Abraham offered Isaac — “and the scripture was fulfilled” then (James 2:21–23). A bare, once-for-all external crediting cannot be “fulfilled” by a deed performed years afterward. The reckoning was the beginning of a living righteousness, brought to completion in works of love — “by works a man is justified; and not by faith only” (James 2:24).

Because the caricature is durable — “Catholics think they earn heaven” — it is worth hearing the doctrine in the Church’s own words. The Council of Trent, defining justification in 1547, taught that it is “not remission of sins merely, but also the sanctification and renewal of the inward man.” And it named the cause precisely against imputation: “the alone formal cause is the justice of God, not that whereby He Himself is just, but that whereby He maketh us just” — a sentence lifted almost verbatim from Augustine. Where Protestantism locates the formal cause of justification in a righteousness outside us, Trent locates it in a righteousness God works within us. The two systems do not differ over whether grace saves; they differ over whether grace only covers or truly transforms.

Trent then drew the line exactly at imputation, in its eleventh canon: if anyone says that men are justified “by the sole imputation of the justice of Christ, or by the sole remission of sins, to the exclusion of the grace and the charity which is poured forth in their hearts by the Holy Ghost, and is inherent in them… let him be anathema.” Note what is condemned and what is not. The Church does not deny that Christ’s righteousness is the source, nor that sins are remitted; she denies that justification is by these alone, to the exclusion of an inherent, infused charity. The Catechism states the same in our own day: in justification God does not merely reckon a status; the “first work of the grace of the Holy Spirit is conversion” (CCC 1989), and justification “detaches man from sin which contradicts the love of God, and purifies his heart of sin” (CCC 1990). It is the heart that is purified — not an account that is balanced. The Catholic does not believe works earn salvation as a second engine beside grace. He believes the one grace of God, received through living faith, remits the sinner’s guilt, pours charity into his heart, makes him genuinely righteous, and then crowns the good works that grace itself enables — for, as Augustine said, when God crowns our merits He crowns nothing other than His own gifts.