Did Martin Luther Invent Sola Fide? The Forgotten History of Justification by Faith Alone
One common claim about the Protestant Reformation is that Martin Luther invented sola fide, or justification by faith alone. Depending on who is making the argument, Luther either recovered an ancient Christian teaching or introduced a theological innovation unknown to the early church. Neither account adequately captures the history.
Christian theologians were discussing justification through faith long before Luther, and some explicitly used the language of faith alone. But the presence of a familiar expression does not necessarily mean its author understood it in the same way someone writing centuries later would.
The history of Christian doctrine involves more than the appearance of particular words. It also involves the arguments in which those words were used, the questions theologians were attempting to answer, and the development of ideas that would eventually become central to competing Christian traditions.
The Question Begins in the New Testament
In Romans 3:28, Paul argues that a person is justified by faith apart from works of the Law. Galatians 2:16 presents a similar contrast, insisting that justification does not come through works of the Law but through faith in Jesus Christ. These passages would eventually become central to Protestant theology, although their interpretation has never been entirely straightforward.
Part of the difficulty lies in what Paul meant by the works of the Law. Was he primarily addressing Jewish observances that distinguished Jews from Gentiles, such as circumcision and dietary restrictions? Was he making a broader argument about the inability of human obedience to establish righteousness before God? Or were both concerns involved? The answer affects how we understand Paul’s argument, especially regarding the relationship between faith and obedience.
James introduces another difficulty. In James 2:24, we encounter a statement that appears to move in the opposite direction: a person is justified by works and not by faith alone. The Greek expression for “faith alone” appears in the New Testament itself, but in a negative statement.
Both authors appeal to Abraham, although they emphasize different episodes from his life. Paul draws attention to Genesis 15, where Abraham believes God and his faith is counted as righteousness. James turns to Genesis 22, where Abraham demonstrates his obedience through his willingness to offer Isaac. Whether the authors are addressing different problems, using justification in different senses, or revealing a genuine tension remains debated.
Clement of Rome: Faith and Good Works
One of the earliest Christian discussions of justification through faith outside the New Testament appears in 1 Clement, a letter commonly dated near the end of the first century AD, although its precise date remains debated. Traditionally attributed to Clement of Rome, the letter was written to address a dispute within the Christian community at Corinth, where several church leaders had been removed from their positions.
Clement’s concern was restoring unity and proper conduct within the church. He encouraged humility, obedience, and peace, drawing extensively from the Jewish Scriptures to support his argument. Yet in the middle of this discussion, he made a statement about justification that would become important to later debates.
In chapter 32, Clement explains that Christians are not justified through their own wisdom, understanding, piety, or works performed with a holy heart. Rather, justification comes through faith. He emphasizes God’s action rather than human achievement. Even the qualities associated with religious devotion do not ultimately explain a person’s justification.
Clement then turns immediately to good works. In chapter 33, he encourages Christians to pursue them, appealing to God’s own activity in creation as an example. For Clement, the rejection of justification through personal achievement did not diminish the importance of obedience.
Clement could attribute justification to faith while treating good works as an essential part of Christian conduct. He did not attempt to explain that relationship through the later distinctions between imputed and infused righteousness. His letter was written to resolve a dispute in Corinth, not to construct a systematic theology of salvation.
Origen: Faith and the Forgiveness of Sins
By the third century, Christian biblical interpretation had become considerably more developed. Among its most influential representatives was Origen, whose extensive writings helped shape the interpretation of Scripture for later generations.
Origen’s Commentary on Romans examined Paul’s arguments about sin, the Law, faith, and righteousness. Unlike Clement, who discussed justification while addressing a practical church dispute, Origen was working directly through the biblical text that would eventually occupy such an important place in Reformation theology.
In Book 3 of the surviving commentary, Origen discusses people who received forgiveness from Jesus, including the thief crucified alongside him and the woman who anointed his feet. The thief had no opportunity to establish a record of good works, yet Christ promised him paradise. Origen used such examples to explain how someone could be justified through faith without first performing works of the Law.
The argument did not lead Origen to dismiss good works. His broader theology emphasized spiritual growth, moral responsibility, and the transformation of the believer. Faith could be the beginning of righteousness without exhausting everything involved in the Christian life.
There is also a complication in how his writings have survived. Much of the Commentary on Romans is preserved through the Latin translation and abridgment produced by Rufinus in the early fifth century AD. Because the original Greek survives only in part, the precise Latin wording cannot always be confidently attributed to Origen himself.
Hilary of Poitiers: Faith Alone Justifies
Hilary of Poitiers was a fourth-century bishop remembered primarily for his involvement in the controversies surrounding the doctrine of the Trinity. His writings also provide evidence for how Christians understood faith and forgiveness.
In his Commentary on Matthew, Hilary discusses the account of the paralyzed man brought before Jesus in Matthew 9. Rather than immediately healing the man’s physical condition, Jesus announces the forgiveness of his sins. The scribes object, recognizing that Jesus is claiming an authority they associate with God.
Hilary understood the episode as demonstrating Christ’s ability to forgive sins. In explaining what Christ accomplished, he wrote, fides enim sola iustificat—“for faith alone justifies” (Commentary on Matthew 8.6).
The statement provides an explicit example of affirmative faith-alone language more than eleven centuries before Luther. Hilary was explaining a particular Gospel passage, especially what Christ accomplished and the significance of faith in receiving forgiveness. He was not addressing the later disputes over the precise relationship between imputed righteousness, inward renewal, and the believer’s standing before God.
Ambrosiaster: An Ancient Commentary Reaches the Reformers
During the fourth century, an anonymous Latin Christian author produced commentaries on Paul’s letters. These writings circulated under the name of Ambrose of Milan, although modern scholarship distinguishes their author from Ambrose and refers to him as Ambrosiaster.
The mistaken attribution gave the commentaries an authority they would retain for centuries. Readers believed they were encountering the biblical interpretations of one of the great bishops of the early church. That would become particularly significant when the Reformers began appealing to earlier Christian writers.
Ambrosiaster repeatedly emphasized the gracious character of salvation. In his discussion of Romans 3:24, he described God’s gift as something received through faith alone, without prior works establishing a claim upon God. The sinner did not earn forgiveness through personal achievement or place God under an obligation to provide it.
Ambrosiaster revised his commentary on Romans, leaving three principal recensions identified by scholars as α, β, and γ. In the explanation of Romans 3:24, α and β use iustificati, meaning “justified,” while γ uses sanctificati, meaning “sanctified.” Theodore de Bruyn’s modern translation follows γ, while documenting the other readings. All three preserve the language of faith alone, although the difference between justification and sanctification complicates attempts to identify his position with a later theological system.
Ambrosiaster’s commentary on 1 Corinthians 1:4 provides another example, associating the free forgiveness of sins with faith apart from works.
More than a thousand years later, this passage appeared in the Augsburg Confession, where the Reformers cited it under the name of Ambrose. They believed an early Christian bishop had expressed a position resembling their own. Although the attribution was mistaken, the text itself was ancient.
Augustine: Grace and the Transformation of the Sinner
Augustine of Hippo became one of the most influential theologians in Christian history. His writings shaped Western discussions of original sin, grace, free will, and salvation for more than a thousand years. Both Catholics and Protestants would eventually appeal to his authority, although they did not always agree about what his theology required.
Much of Augustine’s mature understanding of grace developed through his disputes with Pelagius and those associated with his teachings. At the center of the controversy was the question of what human beings could accomplish through their own natural abilities. Could they obey God and become righteous through the proper exercise of their wills, or did even the beginning of faith depend upon divine grace?
Augustine increasingly emphasized the necessity of grace. Human beings could not simply make themselves righteous through determination or obedience. Sin had affected the human will, and restoration required God’s initiative. Even the faith through which someone turned toward God depended upon grace.
Augustine’s understanding of justification becomes particularly clear in On the Spirit and the Letter. In chapter 45, he argues that good works do not precede justification as achievements through which someone earns God’s acceptance. Rather, justification makes a person capable of performing those works. Augustine understood being justified as being made righteous through God’s action.
Earlier in the same work, in chapter 26, he connects genuinely good works with faith operating through love. Grace therefore precedes righteous conduct while also transforming the person who receives it.
The Reformers could appeal to Augustine’s insistence that salvation depended upon divine grace rather than human merit. Catholic theologians could appeal to his understanding of justification as something that changed the sinner inwardly. Neither tradition simply reproduced Augustine’s theology unchanged.
Medieval Theology: Grace, Merit, and Righteousness
The familiar account in which the early church preached grace, the medieval church replaced it with works, and Luther restored the original teaching does not adequately represent medieval theology.
Medieval Christian thinkers continued to regard grace as essential to salvation. They disagreed over how that grace operated, what role human cooperation played, and how the language of merit should be understood.
Bernard of Clairvaux provides a particularly interesting example. Writing in the twelfth century, he spoke about righteousness in terms that could sound familiar to later Protestants. In Sermon 61 on the Song of Songs, Bernard describes finding in Christ what he lacks in himself. Rather than placing confidence in his own righteousness, he appeals to Christ’s mercy and the righteousness that comes from him. Yet Bernard’s understanding of salvation also involved the transformation of the believer through love, and his language belonged to the devotional and theological world of medieval monasticism.
Thomas Aquinas approached justification through a more systematic examination of grace. Writing in the thirteenth century, he drew heavily upon Augustine while incorporating distinctions developed through medieval philosophy and theology.
In the Summa Theologiae (I–II, question 113), Aquinas identified four elements involved in justification: the infusion of grace, the movement of the will toward God through faith, the rejection of sin, and the forgiveness of sins.
These were not four successive achievements through which someone gradually earned justification. Aquinas understood justification as God’s action, occurring instantaneously, with the elements distinguished according to their relationship to one another. Grace was the cause that enabled the sinner’s response.
Aquinas believed that God moved the human will without eliminating its freedom. The sinner genuinely responded through faith and turned away from sin, but this response was itself made possible by grace. Human cooperation was therefore not an independent achievement preceding God’s action.
For Aquinas, forgiveness and the infusion of grace belonged together because God brought the sinner from a condition of unrighteousness into righteousness. Justification did not merely change how God regarded the person. It changed the person being justified.
Luther and the Reformation
When Martin Luther began lecturing on Romans in 1515 AD, he was entering a theological discussion that had been developing since the earliest centuries of Christianity.
His concerns were shaped by his reading of Paul, his Augustinian background, and his objections to particular explanations of righteousness and merit. Over time, he increasingly emphasized that the believer’s acceptance before God rested upon Christ rather than personal moral achievement.
Faith received the promise of forgiveness through Christ. The sinner did not first need to establish a sufficient record of righteousness before receiving that promise.
Luther did not regard good works as unnecessary. In his 1522 preface to Romans, he described genuine faith as living and active; it produced good works. Faith was not merely intellectual agreement with Christian teachings. It involved trust in God and resulted in a changed life.
The Augsburg Confession of 1530 AD gave this understanding a formal expression. Article IV taught that human beings could not be justified through their own strength, merits, or works, but were justified for Christ’s sake through faith. Article VI then affirmed the necessity of good works while rejecting the idea that they merited justification.
Article VI also appealed to an ancient Christian authority. It cited a statement attributed to Ambrose explaining that believers received forgiveness freely, apart from works, through faith alone. The passage came from the Pauline commentary now associated with Ambrosiaster.
The Apology of the Augsburg Confession developed the argument further. Its authors recognized that Scripture could speak of justification in connection with making the unrighteous righteous or regenerating them, as well as pronouncing or counting them as righteous. They nevertheless insisted that forgiveness and acceptance before God were received through faith rather than earned through the believer’s love or obedience.
Lutheran theology therefore affirmed that God transformed believers. The disagreement concerned how that transformation related to justification and whether inward righteousness formed part of the basis upon which a sinner was accepted before God.
Trent and the Catholic Understanding of Justification
The Council of Trent addressed justification in 1547 AD, responding to the controversies that had divided Western Christianity.
Trent rejected important elements of the Lutheran understanding of justification by faith alone, but it did not teach that sinners could independently earn their initial justification through good works.
Chapter 8 of its decree states that nothing preceding justification, whether faith or works, merits the grace of justification. Initial justification remained a gift of God rather than a reward for unaided human achievement.
The disagreement becomes clearer in chapter 7, where Trent describes justification as involving both the forgiveness of sins and the inward renewal of the person. Through grace, the sinner is not only forgiven but made righteous.
Trent also distinguished the initial reception of justification from subsequent growth in righteousness. Chapter 10 taught that those already justified could increase in the righteousness they had received. Good works performed through grace contributed to that growth, rather than operating independently of divine assistance.
The Lutheran confessions rejected the idea that such works contributed merit to the believer’s justification. They maintained that forgiveness and acceptance before God rested upon Christ and were received through faith.
Both traditions insisted upon the necessity of grace and the importance of good works. They differed over the nature of justifying righteousness, whether justification included an inward righteousness that could increase, and how grace-enabled obedience related to salvation.
Conclusion: Did Luther Invent Sola Fide?
Martin Luther was not the first Christian theologian to speak of justification through faith alone. The expression appears in Christian writings more than a thousand years before the Reformation, and the underlying discussion reaches back to the New Testament itself. Hilary of Poitiers used the language explicitly in the fourth century, while Ambrosiaster developed similar arguments in his commentaries on Paul. The Reformers later appealed to those commentaries when defending their own teaching.
But identifying the phrase is only part of the investigation. Clement could attribute justification to faith while immediately encouraging good works. Origen used the penitent thief to explain justification without prior works, yet continued to emphasize Christian obedience. Augustine placed grace at the center of salvation while understanding justification as an inward transformation. Medieval theologians inherited these ideas and developed their own explanations of how grace, faith, and righteousness related to one another.
Luther entered this discussion in the sixteenth century. His understanding of justification drew upon biblical passages and theological arguments that Christians had been examining for centuries, but the doctrine that emerged from the Reformation also reflected the particular questions and controversies of his own time.
The claim that Luther invented justification by faith alone overlooks substantial evidence from earlier Christian literature. The opposite claim, that the complete Lutheran doctrine had been taught unchanged since the first century, goes beyond what those writings establish. Luther did not invent the discussion, nor did he invent the language. His contribution was to develop and defend a particular understanding of justification within a theological tradition that was already more than a thousand years old.
Primary Sources and Further Reading
Source note: Hilary’s page reference follows D. H. Williams’s published citation; Ambrosiaster’s Romans 3:24 is quoted with its recension variants noted. These are edition-based references, not an independent manuscript collation.
1. 1 Clement 32:4–33:1 (Greek text and modern translation).
2. Hilary of Poitiers, Commentary on Matthew 8.6; Jean Doignon, ed., Sources Chrétiennes 254 (1978), 200 (page reference reported by D. H. Williams, 2006, n. 41).
3. Ambrosiaster, Commentary on Romans 3:24 (recensions α and β: iustificati; γ: sanctificati; see de Bruyn, 2017, 68, and scholarship on the recensions); Commentary on 1 Corinthians 1:4.
4. Origen, Commentary on Romans (surviving Greek and Rufinus’s Latin version).
5. Augustine, On Faith and Works; On the Spirit and the Letter.
6. Bernard of Clairvaux, Sermons on the Song of Songs, sermon 61.
7. Thomas Aquinas, Summa Theologiae I–II, question 113.
8. Luther, Preface to Romans (1522 AD); Augsburg Confession, articles IV and VI (1530 AD); Apology of the Augsburg Confession, article IV (1531 AD).
9. Council of Trent, Session VI, Decree on Justification (1547 AD), chapters 7–10 and canons 9–11, 32.
10. D. H. Williams, “Justification by Faith: A Patristic Doctrine,” Journal of Ecclesiastical History 57, no. 4 (2006): 649–667. DOI: 10.1017/S0022046906008207.
11. Theodore S. de Bruyn, trans., Ambrosiaster’s Commentary on the Pauline Epistles: Romans (SBL Press, 2017), 68 (Romans 3:24; final recension).
12. Thomas P. Scheck, Origen and the History of Justification (University of Notre Dame Press, 2008).
