Everything else in this section is downstream of this page. Remove the Roman doctrine of justification and purgatory has nothing to collect, indulgences have nothing to remit, the Mass has nothing left to offer, and the sacramental system has nothing left to dispense. Luther understood this from the beginning, which is why he would not yield an inch on it while yielding much elsewhere.

The disagreement is not about whether grace is necessary. Rome insists that it is, and that no one is justified apart from it. Nor is it about whether good works matter; both sides say they do. The disagreement is about a single question, and it can be put in one sentence: is the righteousness by which a sinner stands accepted before God a righteousness worked in him, or a righteousness reckoned to him?

On that question there is no middle ground, and both communions have said so formally.

What Rome Teaches

The definition must be taken from Rome’s own books, and taken whole, because the Roman doctrine is frequently misstated by Protestants who reduce it to “salvation by works.” It is not that, and calling it that will not survive contact with a well-catechized Catholic.

Rome teaches that justification is a work of grace, merited by Christ’s passion, and received first in baptism. But it is not a verdict pronounced upon the sinner; it is a change wrought within him:

Justification is not only the remission of sins, but also the sanctification and renewal of the interior man.¹ Catechism of the Catholic Church§ 1989

That single sentence is the whole difference in miniature. For Rome, justification and sanctification are not two gifts but one process: God does not merely declare the sinner righteous, he makes him righteous, and the making is the justifying. The Catechism adds that justification “is conferred in Baptism, the sacrament of faith,” and that it conforms us to the righteousness of God, “who makes us inwardly just by the power of his mercy.”²

The Council of Trent had said the same in 1547, and said it with scholastic precision. Asked what the formal cause of justification is — that is, what actually constitutes a man just before God — the council answered that there is only one, and it is a righteousness that makes rather than reckons:

The alone formal cause is the justice of God, not that whereby He Himself is just, but that whereby He maketh us just.³ Council of TrentSession VI, Chapter VII, 1547

Note the word alone. Trent is not merely affirming inherent righteousness; it is excluding any other formal cause — which is precisely a denial that imputed righteousness can be the ground of acceptance.

Infused, Increased, and Losable

Three consequences follow from that definition, and together they describe the Christian life as Rome understands it.

Justification is infused, not imputed. Grace, in the Roman account, is not primarily God’s favorable disposition toward the sinner but a supernatural quality poured into the soul, making it actually pleasing to God. See Table RCC4. This is why the sacraments are necessary rather than merely helpful: they are the appointed channels of the infusion.

Justification increases. Because the righteousness is inherent, it admits of degrees, and cooperation increases it. Trent made this binding under anathema, and the canon is worth reading for what it denies as much as for what it affirms — it condemns the view that good works are only the fruits and signs of justification:

If any one saith, that the justice received is not preserved and also increased before God through good works; but that the said works are merely the fruits and signs of Justification obtained, but not a cause of the increase thereof; let him be anathema.⁴ Council of TrentSession VI, Canon XXIV, 1547

And Canon XXXII goes further, teaching that the justified man by his good works “truly merit[s] increase of grace, eternal life, and the attainment of that eternal life … and also an increase of glory.”⁵ The word is merit, and it is used deliberately.

Justification can be lost. If righteousness is a quality in the soul, it can be destroyed; mortal sin destroys it. The justified man may therefore fall from grace and must be restored — not by returning to his baptism, which cannot be repeated, but through the sacrament of penance, with its contrition, confession, and satisfaction. This is the door through which the whole penitential system enters, and with it the debt of temporal punishment that purgatory exists to collect.

The pastoral consequence is the one the Reformers pressed hardest. On these terms no one can know that he is right with God, because the question is not what has Christ done? but what is the present state of my soul? — and no man can answer that with certainty. Trent frankly conceded the point, teaching that no one “can know with a certainty of faith, which cannot be subject to error, that he has obtained the grace of God.”⁶

The Canons of Session VI

On 13 January 1547 the Council of Trent issued thirty-three canons on justification, each ending in the same formula. They are the most important documents in the entire controversy, because they are not a description of Roman teaching but a condemnation of the Reformation’s.

Canon XI is the decisive one. Read it slowly, because it condemns imputation by name, and because its final clause defines grace itself:

If any one saith, that men are justified, either 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; or even that the grace, whereby we are justified, is only the favour of God; let him be anathema.⁷ Council of TrentSession VI, Canon XI, 1547

Two things are anathematized there. The first is justification by the sole imputation of Christ’s righteousness — which is the Reformation doctrine, stated in the Reformation’s own terms. The second is the proposition that justifying grace is only the favour of God. But that is exactly what the Reformers said grace is, and what Scripture appears to say it is. To call grace God’s favor and nothing more is, by the judgment of this canon, to be accursed.

The others fill out the picture. Canon IX condemns justification by faith alone. Canon XII condemns the Reformation’s definition of faith itself — that justifying faith “is nothing else but confidence in the divine mercy which remits sins for Christ’s sake.”⁸ And Canon XXX condemns the denial of temporal punishment remaining after pardon.⁹

These canons have never been rescinded. Whatever warmth has entered the modern conversation — and some of it is genuine — the conciliar definitions stand.

What the Reformers Recovered

Against all of this the Reformers set a single claim: that God justifies the ungodly, and does so by reckoning to him a righteousness that is not his own.

Luther put it not as a theorem but as a marriage. In The Freedom of a Christian (1520) he described faith as the bond that unites the soul to Christ as a bride to her husband, so that what belongs to each becomes the other’s:

Christ is full of grace, life, and salvation; the soul is full of sin, death, and condemnation. Let faith step in, and then sin, death, and hell will belong to Christ, and grace, life, and salvation to the soul.¹⁰ Martin LutherThe Freedom of a Christian, 1520

That is the doctrine in its native form — not a legal fiction but a real exchange, grounded in a real union. Sin becomes Christ’s because the sinner is joined to him; righteousness becomes the sinner’s on the same ground. The full text is on this site: The Freedom of a Christian.

Calvin gave the doctrine its most careful definition, and the care is deliberate: he defines justification by where the verdict is rendered, not by what is produced in the man:

A man is said to be justified in the sight of God when in the judgment of God he is deemed righteous, and is accepted on account of his righteousness.¹¹ John CalvinInstitutes, III.xi.2

And he states its two parts, neither of which is a change in the sinner’s moral condition: justification “consists in the forgiveness of sins and the imputation of the righteousness of Christ.”¹² Calvin was emphatic that the justified man is also renewed — he insisted no one receives Christ’s righteousness without also receiving his Spirit — but he would not let the renewal be the ground of acceptance. Justification and sanctification are distinguished, never separated.

The confessions state it for the churches. The Heidelberg Catechism answers the question how are you righteous before God? in words a dying believer can rest on: God “grants and credits to me the perfect satisfaction, righteousness, and holiness of Christ, as if I had never sinned nor been a sinner, and as if I had been as perfectly obedient as Christ was obedient for me — if only I accept this gift with a believing heart.”¹³ Observe that the ground is entirely outside the believer, and that faith is named not as a virtue that earns but as the empty hand that receives.

Analytic and Synthetic Justification

The sharpest modern statement of the difference comes from R. C. Sproul, who borrowed a distinction from logic to name it exactly. An analytic statement is true by examining its own terms; a synthetic statement adds something from outside.

For Rome, justification occurs only when under analysis God sees that a person is inherently just. In the Protestant view, our justification is synthetic because God judges us not on the basis of our own righteousness, but on the basis of a righteousness that has been added to us by faith, namely, the righteousness of Christ.¹⁴ R. C. Sproul

Sproul then locates the controversy with precision. It is not finally about faith, or works, or even grace in the abstract:

The ultimate issue between Rome and the Reformation is the issue of the ground of justification. Luther rightly argued that the basis of our justification is our connection to an alien righteousness — a righteousness that, properly speaking, is not our own but belongs to someone else.¹⁵ R. C. Sproul

And he refuses to let the matter be minimized, as it often is in ecumenical settings where the difference is presented as a misunderstanding of terms:

The difference is not a tempest in a teapot; it’s one by which salvation itself is defined.¹⁶ R. C. Sproul

Was It a Novelty?

An honest page must face the strongest objection, and the strongest objection is historical rather than exegetical. It is this: if justification by imputed righteousness is the gospel, why does it appear so late? Where was it for fifteen centuries?

The objection is given its force by an evangelical scholar, not a Roman one. Alister McGrath’s Iustitia Dei is the standard history of the doctrine in English, and McGrath is candid about what the sources show. Medieval theology, working from the Vulgate’s iustificare — to make righteous — had understood justification as transformation. The Reformers, working from the Greek, understood it as declaration. And that, McGrath says, was something new:

A fundamental discontinuity was introduced into the western theological tradition where none had ever existed, or ever been contemplated, before.¹⁷ Alister McGrathIustitia Dei

The Reformation understanding of the nature of justification — as opposed to its mode — must therefore be regarded as a genuine theological novum.¹⁸ Alister McGrathIustitia Dei

Roman apologists cite these sentences frequently, and they are entitled to. But three things must be said in reply, and they are not evasions.

First, McGrath is not arguing that the doctrine is false. He is an evangelical Anglican who holds justification by faith; he is writing history, not adjudicating truth. That a doctrine was clarified late says nothing about whether it is apostolic — as the fourth-century church discovered when it had to coin homoousios, a word found in no Scripture, to defend what Scripture plainly taught.

Second, McGrath’s own qualification matters. He distinguishes the nature of justification from its mode, and it is the nature — the forensic conception — that he calls novel. On the mode, the insistence that justification is by grace and not by human merit, he traces a long line back through Augustine. The Reformers did not invent grace; they recovered the forensic category that a mistranslation had obscured.

Third, and decisively, the question is not what the medieval church taught but what Paul taught. A Latin verb had been carrying a weight the Greek verb will not bear. Dikaioo in Paul is a courtroom word, not a clinic word; it is what a judge does, not what a physician does. That is why Paul can say God “justifies the ungodly” (Romans 4:5) — a sentence that is simply incoherent if justify means make inwardly righteous, since the ungodly would then be godly already and would need no justifying.

The Reformation claim, then, was never that the church had always taught this clearly. It was that the apostles taught it, that the church had lost it, and that a translation had helped her lose it. Which is one more reason the recovery of the Scriptures in their original tongues and the recovery of the gospel happened at the same moment, and not by coincidence. See Traditions and Sola Scriptura.

Why It Cannot Be Split

Luther called this doctrine the article by which the church stands or falls — or nearly so. His own words, in the 1532 lectures on Psalm 130, were that with this article the church stands, and without it she falls; the crisp Latin tag articulus stantis et cadentis ecclesiae is a later formulation.²⁰ The sentiment is certainly his.

Why should one doctrine bear that weight? Because it alone answers the question every other doctrine assumes: on what basis does a holy God receive a sinner? Get that wrong and nothing downstream can be right. Sproul states the consequence without softening: “Without the doctrine of justification by faith alone, the gospel is not merely compromised, it is lost altogether.”¹⁹

This has a bearing on the ecumenical conversations of recent decades, which are treated more fully elsewhere on this site. Real convergence has been claimed, and some of the language of those documents is warmer than anything written in the sixteenth century. But the canons of Session VI were not withdrawn, the formal cause was not redefined, and Canon XI still stands over the word imputation. Charity requires us to speak kindly of Roman Catholics, many of whom are more devout than we are. It does not require us to pretend that an anathema is a nuance.

The Righteousness of God through Faith

The doctrine is not finally established by councils or confessions, and not by Luther or Calvin either. It is established by an apostle, writing to Rome.

The verdict is forensic. Paul’s vocabulary is the vocabulary of the courtroom, and he uses it deliberately: “Who shall bring any charge against God’s elect? It is God who justifies. Who is to condemn?” (Romans 8:33–34). Justify is set opposite condemn, and condemning is not making a man wicked but declaring him guilty. The opposite of a declaration of guilt is a declaration of righteousness.

The subject is the ungodly. “And to the one who does not work but believes in him who justifies the ungodly, his faith is counted as righteousness” (Romans 4:5). Every word resists the Roman reading. The man does not work. He is ungodly at the moment of justification. And righteousness is counted to him — the accountant’s word, used eleven times in that chapter.

The righteousness is another’s. “For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God” (2 Corinthians 5:21). The exchange runs both directions, and neither direction is infusion: Christ was not made inwardly sinful, and we are not made inwardly divine. Paul says the same of himself, and names the alternative he rejected: that he might be found in Christ, “not having a righteousness of my own that comes from the law, but that which comes through faith in Christ, the righteousness from God that depends on faith” (Philippians 3:9).

And it is received, never earned. “We know that a person is not justified by works of the law but through faith in Jesus Christ … because by works of the law no one will be justified” (Galatians 2:16). “He saved us, not because of works done by us in righteousness, but according to his own mercy … so that being justified by his grace we might become heirs according to the hope of eternal life” (Titus 3:5–7). And the note Paul strikes in Romans 11:6 forecloses every attempt at a mixture: “But if it is by grace, it is no longer on the basis of works; otherwise grace would no longer be grace.”

The fruit of the doctrine is peace. This is where the argument becomes pastoral, and where it finally matters. “Therefore, since we have been justified by faith, we have peace with God through our Lord Jesus Christ” (Romans 5:1). The verb is past and the peace is present. A man whose acceptance rests on a righteousness worked in him must always look inward and will always find reason to doubt; a man whose acceptance rests on a righteousness reckoned to him looks outward to Christ and finds nothing there to doubt. That is not presumption. It is the assurance Scripture commands, and it is why the Reformation was experienced not first as a controversy but as a deliverance.

Nor does the doctrine leave the justified man idle. The faith that receives Christ’s righteousness also receives his Spirit, and the tree that has been made good bears fruit. We are “created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them” (Ephesians 2:10) — but that verse follows verses eight and nine, and the order is the gospel. Works are the evidence of justification, never its cause.

So the question the sinner must answer is not whether he has cooperated sufficiently, nor how much grace remains in his soul, nor what he still owes. It is whether he will come with empty hands. “To the one who does not work but believes” — there is the door, and it is the only one.

Roman Catholicism   Sola Fide   Comparison Table

Sources

1. Catechism of the Catholic Church, § 1989. ↩
2. Catechism of the Catholic Church, § 1992. ↩
3. Council of Trent, Session VI (13 January 1547), Decree Concerning Justification, chapter VII, in The Canons and Decrees of the Sacred and Oecumenical Council of Trent, trans. J. Waterworth (London: Dolman, 1848). ↩
4. Trent, Session VI, Canons Concerning Justification, canon 24. ↩
5. Trent, Session VI, canon 32. ↩
6. Trent, Session VI, chapter IX, “Against the vain confidence of Heretics.” ↩
7. Trent, Session VI, canon 11. ↩
8. Trent, Session VI, canons 9 and 12. ↩
9. Trent, Session VI, canon 30. See Purgatory. ↩
10. Martin Luther, Concerning Christian Liberty (The Freedom of a Christian, 1520), trans. R. S. Grignon. Full text: The Freedom of a Christian. ↩
11. John Calvin, Institutes of the Christian Religion, III.xi.2, trans. Henry Beveridge (Edinburgh: Calvin Translation Society, 1845). ↩
12. Calvin, Institutes, III.xi.2. ↩
13. Heidelberg Catechism (1563), Question 60. Full text: The Heidelberg Catechism. ↩
14. R. C. Sproul, “Making Molehills Out of Mountains,” Ligonier Ministries. See also Faith Alone: The Evangelical Doctrine of Justification (Grand Rapids: Baker, 1995). ↩
15. Sproul, “Making Molehills Out of Mountains.” ↩
16. Sproul, “Making Molehills Out of Mountains.” ↩
17. Alister E. McGrath, Iustitia Dei: A History of the Christian Doctrine of Justification (Cambridge: Cambridge University Press), 186–187. ↩
18. McGrath, Iustitia Dei, 187. McGrath is an evangelical Anglican writing as a historian of doctrine; the judgment concerns the history of the concept, not its truth. ↩
19. Sproul, “Making Molehills Out of Mountains.” ↩
20. On Luther’s formulation see his lectures on Psalm 130 (1532–33), D. Martin Luthers Werke (Weimar), 40/III:352. The Latin tag articulus stantis et cadentis ecclesiae is a later coinage. ↩

Scripture quotations are from the English Standard Version.