The Epistle to the Galatians — The Undisputed Letter at the Heart of the Canon's First War

Part of the series: The New Testament Canon—How 27 Books Survived the Ancient Gauntlet

Most of the books in this series earned their place in it by nearly losing their place in the canon. Second Peter was doubted for three centuries. Third John was almost too short to notice. Revelation was read at Nicaea and then quietly dropped from the Eastern liturgy. Galatians is different. No father of the church ever proposed removing it, no regional council ever left it off a list, and no modern scholar, however skeptical, has ever seriously denied that Paul wrote it. It sits in Eusebius’s category of the homologoumena, the “acknowledged” books, without an asterisk.⁠¹

So why give it a full essay in a series about disputed books? Because the canon is not only a list of what survived. It is also the record of a fight over what Scripture is and who gets to decide—and Galatians stood at the center of that fight from the beginning. The first person ever to publish a fixed set of Christian scriptures made Galatians the opening letter of his collection. The orthodox writers who answered him had to wrestle the letter back. And the letter itself is a sustained argument about authority: about which gospel binds, which apostle was right, and where a message from God actually comes from. Galatians did not need defending. It did the defending. This is the story of the undisputed letter that shaped the disputed canon more than almost any book in it.

The Letter Marcion Put First

Sometime around the year 144, a wealthy shipowner’s son from Sinope named Marcion presented the Roman church with a theology so radical that it expelled him and returned his donation. Marcion taught that the God of the Hebrew Scriptures—the Creator, the lawgiver, the judge—was a lower and inferior deity, and that Jesus had revealed a previously unknown God of pure grace who had nothing to do with the Law or the prophets. To carry this system, Marcion did something no Christian had done before: he drew up a closed list of authoritative books. It contained a single Gospel, a shortened version of Luke stripped of its infancy narrative, and ten letters of Paul. He rejected the three Pastoral Epistles and made no use of Hebrews. This Apostolikon, as the collection of letters was later called, is the earliest fixed Christian scripture-list we can reconstruct.⁠²

Marcion put Galatians first.⁠³ The choice was not arbitrary. Galatians is the most polemical of Paul’s letters against the Jewish law, and Marcion read it as the Rosetta Stone of his whole system. Here Paul insisted that his gospel came “not from a human being” but by direct revelation; here he recounted opposing Peter “to his face”; here he pronounced a double curse on anyone—even an angel—who preached “a different gospel.” To Marcion, this proved that the true Pauline gospel had been corrupted from the start by a Judaizing counterfeit, and that Paul alone had preserved it uncontaminated. Even Tertullian, writing his massive rebuttal a half-century later, conceded the letter’s force. The epistle to the Galatians, he admitted, is “the most decisive against Judaism,” the one in which the apostle instructs his converts against the Law.⁠⁴

But Marcion did not merely arrange Paul’s letters. He edited them. Convinced that the original text had been salted with pro-Jewish interpolations, he took his knife to the letters he preserved, cutting whatever tied the gospel to the Creator or to the promises made to Israel. Tertullian says the Gospel Marcion used prepared him “to expect to find the epistles also mutilated by him with like perverseness.” In Galatians, Tertullian charges, “what the heretic’s industry erased was the mention of Abraham’s name”—because Paul’s argument that Gentile believers are the true “children of Abraham” was intolerable to a man who had severed Christianity from Israel’s God.⁠⁵ When the cuts grew too many to catalog, Tertullian gave up itemizing them with a line that has echoed for eighteen centuries: “Fie on Marcion’s sponge!”⁠⁶

Reconstructing exactly which verses Marcion removed is delicate work, and honesty requires a caution here. The fathers tell us Marcion’s readings only where they chose to comment on them; the precise boundaries of his deletions—which half-verses of chapter three he cut, where he began and ended—are the careful inference of modern scholars, above all Adolf von Harnack, whose 1924 reconstruction remains the foundation of the field. Later scholars such as Ulrich Schmid have warned against reading a father’s silence as evidence of a deletion.⁠⁷ What is not in doubt is the shape of the thing: the first Christian canon was a weapon, Galatians was its cutting edge, and the letter had to be pried out of a heretic’s hands before it could sit peacefully among the twenty-seven.

A Gospel Not from Man

To understand why Galatians was so useful to Marcion—and so central to everyone who came after—you have to see what an unusual letter it is. Paul’s letters almost always open with thanksgiving. He thanks God for the Romans’ faith, for the Corinthians’ gifts, for the Philippians’ partnership. Galatians has no thanksgiving at all. Paul moves from the greeting straight to a rebuke: “I am amazed that you are so quickly forsaking the one who called you by the grace of Christ for a different gospel.”⁠⁸ In place of the customary blessing he lays down a curse, and he says it twice for emphasis: “even if we or an angel from heaven should preach to you a gospel other than the one that we preached to you, let that one be accursed!”⁠⁹ The Greek word behind “accursed” is anathema. It is the vocabulary of the canon before there was a canon—the language of drawing a hard line around a message and declaring everything outside it null.

What follows is the most autobiographical passage Paul ever wrote, and it is an argument about authority. His gospel, he insists, “is not of human origin. For I did not receive it from a human being, nor was I taught it, but it came through a revelation of Jesus Christ.”⁠¹⁰ He then proves his independence by tracing his movements after his conversion with an almost legal precision—three years before his first visit to Jerusalem, fourteen years before the next—and he underlines the account with an oath: “As to what I am writing to you, behold, before God, I am not lying.”⁠¹¹ He met Peter and James, he says, but he did not receive his commission from them; the two apostolates, his to the Gentiles and Peter’s to the circumcised, were recognized as parallel and equal.

Then comes the scene that would occupy the church for centuries. At Antioch, Paul writes, Peter had been eating freely with Gentile converts until “some people came from James,” after which he drew back and separated himself out of fear of “the circumcised.” Paul’s response was not private: “when Cephas came to Antioch, I opposed him to his face because he clearly was wrong.” He confronted the chief of the apostles in front of the whole community: “If you, though a Jew, are living like a Gentile and not like a Jew, how can you compel the Gentiles to live like Jews?”⁠¹² A letter that opens by cursing false gospels and then narrates one apostle rebuking another over the truth of the gospel is, in effect, a meditation on what is and is not authoritative. It is no accident that a document so preoccupied with authority became a battleground over it.

The Orthodox Reclaim

Marcion forced a response, and the response reshaped Christian history. The great critique of the twentieth-century historian Adolf von Harnack was that Marcion’s fixed Evangelion and Apostolikon were the decisive provocation that pushed the mainstream church to define its own authoritative New Testament—that the heretic, by drawing a boundary, forced the church to draw a better one. Hans von Campenhausen sharpened the claim: one cannot properly speak of a Christian “canon,” in the strict sense of a closed and exclusive list, before Marcion made the church confront the question.⁠¹³

That thesis is real but partial, and the qualification matters. A collection of Paul’s letters, and the conviction that they carried authority, existed well before Marcion; he selected and mutilated from an inheritance he did not create. Bruce Metzger put the balance precisely: Marcion did not invent the idea that a book could be authoritative Scripture, but he did accelerate the process by which the church closed its list. David Trobisch has argued that the Pauline letters show signs of a very early edited collection—a core of Romans, the Corinthian letters, and Galatians circulating together—that antedates the heretic entirely.⁠¹⁴ The fair synthesis is this: the idea of an authoritative Paul was older than Marcion, but the pressure to fix and close the canon owes a great deal to the need to answer him. Galatians sat at the hinge either way.

The orthodox writers did not cede the letter. Irenaeus, writing around 180, quoted Galatians precisely against the heretics—citing Paul’s words that “God sent his Son, born of a woman, born under the law” to prove that the one God of Israel and the Father of Jesus are the same God, the very identity Marcion denied.⁠¹⁵ Tertullian’s method was more audacious still: he refused to argue from the verses Marcion had cut and instead confuted him “from that which he has retained,” dismantling the two-God reading out of Marcion’s own abridged edition. The strategy was to show that even the mutilated Galatians proclaimed the Creator’s gospel.

By the end of the second century, the letter’s place in the mainstream collection was simply assumed. The Muratorian Fragment—a Latin list of the New Testament books, usually dated to around 170, though a minority of scholars argue for a fourth-century origin—names Galatians twice. It appears in a short summary of Paul’s letters, “next, to the Galatians, against circumcision,” and again in a remarkable numerological argument: Paul, the Fragmentist says, following the example of John writing to seven churches in Revelation, also wrote “by name to only seven churches,” listing them in order, “to the Galatians fifth.” The point is that the sevenfold address signifies the one universal church. And in the same breath the Fragment rejects a forged letter “to the Laodiceans” and another “to the Alexandrians,” both “forged in Paul’s name to further the heresy of Marcion.”⁠¹⁶ The reclamation was complete: the letter Marcion had made the first plank of his canon was now the fifth of Paul’s seven churches, a witness to catholic unity and a rebuke to Marcion himself.

The Paper Trail

If Galatians was never seriously doubted, it is worth asking what the external evidence for it actually looks like, because the strength of that evidence is part of why it was never doubted. The trail begins early. Polycarp of Smyrna, a disciple of the apostolic generation writing to the Philippians perhaps around 110 to 135, weaves Galatians into his prose without naming it, the way a man quotes a book he assumes his readers know by heart. “Knowing, then, that ‘God is not mocked,’” he writes—the words of Galatians 6:7. He calls the heavenly Jerusalem, in Paul’s phrase, “the mother of us all,” from Galatians 4:26. He echoes Galatians 1:1 on the God “who raised him from the dead,” and Galatians 2:2 on those who have not “run in vain.”⁠¹⁷ These are allusions rather than formal citations, and honesty requires the distinction; but four touchpoints in one short letter, from a man one generation removed from the apostles, is powerful testimony that Galatians was circulating and authoritative before Marcion was born.

The manuscript evidence is equally strong. The earliest substantial copy of Paul’s collected letters is Papyrus 46, the Chester Beatty–Michigan codex, which most scholars date to somewhere between about 175 and 225—“around the year 200” is the usual shorthand. It is a single-quire codex of the Pauline corpus, and Galatians sits securely inside it, in a collection that notably places Hebrews immediately after Romans and treats it as fully Pauline.⁠¹⁸ A century and a half later, the great fourth- and fifth-century codices—Sinaiticus, Vaticanus, Alexandrinus—all contain Galatians without hesitation. There is no stage of the manuscript tradition at which the letter is missing or marked as doubtful.

There is even a witness inside the New Testament itself. The Second Letter of Peter, looking back on Paul, speaks of “our beloved brother Paul” who “wrote to you” and adds that he did so “in all his letters”—a phrase that presupposes a known collection—before making the striking remark that the ignorant distort Paul’s letters “as they do the rest of the scriptures.”⁠¹⁹ Whatever one concludes about the date of 2 Peter, the passage is the earliest surviving evidence that Paul’s letters circulated as a recognized group and were already being ranked among “the scriptures.” Galatians, one of the four letters no one has ever doubted Paul wrote, was at the heart of that group from the start.

Who Wrote It, When, and to Whom

On the question of authorship, Galatians occupies a peculiar and enviable position: it is a point of near-total agreement across an otherwise fractious field. It belongs to the seven letters that even the most skeptical critics accept as authentically Pauline. The nineteenth-century Tübingen scholar Ferdinand Christian Baur, who dissolved most of the New Testament into second-century forgery, kept only four letters as genuine—the Hauptbriefe, the “chief letters”: Romans, First and Second Corinthians, and Galatians. That Baur’s acid never touched Galatians tells you how firm its authenticity is. The letter authenticates itself from within, in the first-person autobiography of chapters one and two and in the closing note where Paul takes the pen from his secretary: “See with what large letters I am writing to you in my own hand!”⁠²⁰

The harder questions are where the Galatians lived and when Paul wrote to them. Two theories have divided scholars for a century and a half. The North Galatian theory, defended in the classic commentary of J. B. Lightfoot, holds that the addressees were ethnic Galatians—the Celtic tribes who had settled the highlands of north-central Asia Minor—whom Paul evangelized on his later journeys, which would place the letter in the mid-fifties. The South Galatian theory, put on archaeological footing by Sir William Ramsay, holds that Paul wrote to the churches he founded on his first missionary journey—Pisidian Antioch, Iconium, Lystra, Derbe—cities in the southern part of the Roman province of Galatia. Paul habitually used Roman provincial names, and “Galatians” is the one term that would embrace the Lycaonians and Phrygians of those cities together.⁠²¹

The debate is not merely geographical, because it bears on a tantalizing possibility: that Galatians is the earliest surviving Christian document. If the South Galatian view is combined with an early date—before the Jerusalem Council of Acts 15—the letter could belong to around AD 48 or 49, edging out even First Thessalonians for the title of Paul’s first letter. The linchpin is the private conference Paul describes in Galatians 2. Is it the same event as the public Council of Acts 15, described in the Book of Acts, or is it the earlier “famine relief” visit of Acts 11? F. F. Bruce and other advocates of the early date argue for the famine visit, and they draw a powerful inference from a silence: if Paul were writing after the Jerusalem Council, which settled the circumcision question in his favor, why does he never once cite its decree? The most economical answer is that the Council had not yet happened—that Galatians was written while the circumcision crisis was still raw and unresolved, which is exactly how the letter reads.⁠²² The question remains genuinely open, but on this reading the letter that Marcion made the first book of his canon may also be, chronologically, the first book of the New Testament to be written.

As for the crisis itself, Paul never calls his opponents “Judaizers”—that later label can flatten a complicated reality. He calls them, more vividly, “some who are disturbing you,” those who “trouble” the churches, and he asks, “Who has bewitched you?”⁠²³ Their demand was that Gentile converts be circumcised and take on observance of the Mosaic law; Paul’s fury is that this addition empties the cross of its sufficiency. Modern scholarship rightly cautions against using “Judaizers” as a slur that caricatures Second Temple Judaism as mere legalism. The men troubling Galatia were, in their own eyes, completing the gospel. Paul thought they were destroying it.

The Theological Heart

At the center of the letter stands a sentence that would eventually split Western Christianity. A person, Paul writes, “is not justified by works of the law but through faith in Jesus Christ.”⁠²⁴ Every word of that clause has been contested. What are the “works of the law”? The traditional reading takes them to mean human works and law-keeping in general, offered as a failed basis for standing before God. The influential “New Perspective on Paul” argues instead that Paul has in view the specific boundary-markers of Jewish identity—circumcision, food laws, the calendar—that were being used to exclude Gentiles from the people of God. And the phrase rendered “faith in Jesus Christ” is itself ambiguous in the Greek: it can mean the believer’s faith directed toward Christ, or “the faithfulness of Christ,” Christ’s own obedient self-offering. The debate is unresolved among serious scholars, and a Catholic reader can hold the tension without embarrassment: justification is grounded in Christ’s faithful act and received by the believer’s faith, and Paul’s Greek may well be reaching for both.⁠²⁵

Paul’s argument for this claim runs through the figure of Abraham and the purpose of the Law. The Law, he says, was never meant to be the permanent means of righteousness; it was a temporary custodian. His word is paidagōgos, and it is routinely mistranslated. The King James “schoolmaster” misleads the modern ear: a paidagōgos was not a teacher but a household slave who escorted a freeborn boy to school and disciplined his conduct along the way. The New American Bible captures it well: “the law was our disciplinarian for Christ, that we might be justified by faith. But now that faith has come, we are no longer under a disciplinarian.”⁠²⁶ The Law was good, God-given, and provisional—a guardian whose authority ends when the heir comes of age.

From that argument Paul draws the great charter of Christian equality: “There is neither Jew nor Greek, there is neither slave nor free person, there is not male and female; for you are all one in Christ Jesus.”⁠²⁷ The verse speaks first to the question that drives the whole letter—who may be counted among Abraham’s heirs—and its answer is that baptism, not circumcision, makes the difference. He then reads the story of Abraham’s two sons, Ishmael by the slave Hagar and Isaac by the free Sarah, as a figure of two covenants. Paul calls his own reading an allegory—“Now this is an allegory”—using the word himself, one of the rare places where an inspired author labels his own interpretation this way. It is a chief scriptural warrant for the Catholic conviction that Scripture carries a spiritual sense beneath the literal, though careful readers distinguish Paul’s typology, in which real historical persons prefigure later realities, from the more elaborate allegorical method of later centuries.⁠²⁸

And then, in the fifth chapter, Paul writes the sentence that Catholic theology would build on for fifteen centuries: “For in Christ Jesus, neither circumcision nor uncircumcision counts for anything, but only faith working through love.”⁠²⁹ Faith that works through love—fides caritate formata, faith formed by charity, in the later Latin formula—is precisely the faith that justifies. The verse would become the hinge of the whole argument over what Paul means when he says a man is justified by faith. But that argument belongs to the sixteenth century. Before it, there was a quieter fight, over a single sentence, between two of the greatest minds the Latin church ever produced.

Peter to His Face

Of all the letters of the New Testament, none provoked a richer body of ancient commentary than Galatians. Marius Victorinus, the aged Roman rhetorician whose conversion Augustine recounts with awe, wrote the earliest surviving Latin commentary on any Pauline letter, and it was on Galatians. John Chrysostom devoted to it a continuous, verse-by-verse commentary—unusual for a preacher who almost always worked in numbered homilies. Jerome, Augustine, Ambrosiaster, Theodore of Mopsuestia, and even Pelagius all wrote on it.⁠³⁰ The letter drew commentators the way a wound draws attention, and the wound was Galatians 2:11–14—Paul’s account of rebuking Peter at Antioch.

The problem was acute. If Paul publicly said that the chief of the apostles “clearly was wrong,” then either Peter really erred, which was uncomfortable, or Paul’s rebuke was somehow not what it appeared. Jerome, following Origen and the Greek tradition, took the second path. In his commentary on Galatians he argued that the confrontation was a kind of staged performance—a “useful pretense.” Peter, he held, knew perfectly well that the Law was no longer binding but pretended to observe it out of pastoral concern for Jewish believers, and Paul only pretended to rebuke him, the two apostles cooperating in a scene meant to teach a lesson. “Peter was thoroughly aware of the abrogation of the law of Moses,” Jerome wrote, “but was compelled by fear to pretend to observe it.”⁠³¹

Augustine was scandalized, and he said so in a letter that opens one of the most consequential exchanges in the history of biblical interpretation. To admit that a sacred writer had recorded something false—even a pious, well-intentioned falsehood—was, Augustine saw, to pull a thread that would unravel the whole garment. “For if you once admit into such a high sanctuary of authority one false statement as made in the way of duty,” he wrote to Jerome, “there will not be left a single sentence of those books which, if appearing to any one difficult in practice or hard to believe, may not by the same fatal rule be explained away.”⁠³² Either the Antioch scene happened as written—Peter genuinely erred, Paul genuinely corrected him—or Scripture’s truthfulness was negotiable. Augustine would not concede the second inch.

The argument ran for years, complicated by letters that went astray in the mail and by the vast distance, geographical and temperamental, between Hippo and Bethlehem. But its outcome shaped the Western doctrine of Scripture. Augustine’s position prevailed in the West: the rebuke was real, Peter’s error was real and venial, and the church would not purchase a comfortable reading of an embarrassing episode at the price of admitting a “useful lie” into inspired Scripture. The principle Augustine hammered out over Galatians 2—that a sacred author cannot assert what is false even from good motives—became foundational for the doctrine of biblical truthfulness that the church has held ever since.⁠³³ It is a striking fact that the truthfulness of Scripture was defined, in part, over a passage in which one apostle calls another wrong. The undisputed letter was, once again, doing the church’s hardest theological work.

The Letter Luther Married

No book of the Bible was dearer to Martin Luther than Galatians. He lectured on it repeatedly, published a commentary in 1519, and returned to it in the great 1535 commentary—drawn from lectures of 1531—that became the fullest statement of his doctrine of justification and his distinction between law and gospel. His affection for it was extravagant and personal; in his Table Talk he is remembered calling the letter his own, likening it to his wife: it is, he said, “my Katharina von Bora.”⁠³⁴ In Galatians Luther found the arsenal of the Reformation: Paul’s insistence that a man is justified “not by works of the law but through faith,” his declaration that Christ “became a curse for us,” and the verse Luther made the very definition of Christian existence—“yet I live, no longer I, but Christ lives in me; insofar as I now live in the flesh, I live by faith in the Son of God who has loved me and given himself up for me.”⁠³⁵

The Catholic Church did not answer Luther by denying that we are justified by faith. It answered by denying that we are justified by faith alone, and it answered from the same letter. The Council of Trent, in its Decree on Justification of January 1547, taught that justifying faith is faith formed by charity, and it grounded the teaching in Galatians 5:6—the faith that “worketh by charity.” Justification, Trent held, is not a mere legal declaration but a real interior renewal, and the faith that saves is never the solitary, workless faith of the imagination but faith alive with love. The council’s ninth canon drew the line sharply: if anyone says “that by faith alone the impious is justified; in such wise as to mean, that nothing else is required to co-operate in order to the obtaining the grace of Justification… let him be anathema.”⁠³⁶ Paul’s letter had opened with an anathema; the council that answered its Protestant reading closed with one.

The deepest tension is not even between Paul and Trent but between Paul and another New Testament writer. Galatians says a man is justified by faith apart from works of the law; the Letter of James says, in the only place in the New Testament where the phrase “faith alone” appears, that “a person is justified by works and not by faith alone.” The Catholic synthesis, which Trent itself built into its decree by quoting James directly, is that the two apostles use their terms differently: Paul excludes the works of the Mosaic law and every ground of boasting from the gift of initial justification, while James excludes the dead, workless faith that never issues in love. Luther, for his part, found the tension so sharp that he disparaged James as “an epistle of straw”—a judgment I have taken up at length in the companion essay on James.⁠³⁷

The argument did not end in the sixteenth century. The most important twentieth-century development was the New Perspective on Paul. E. P. Sanders argued in 1977 that Second Temple Judaism was not the works-righteousness legalism of Protestant caricature but a religion of grace and covenant, and James Dunn, who popularized the phrase “the New Perspective on Paul” in a 1982 lecture—N. T. Wright had used it earlier, in 1978—argued that Paul’s “works of the law” meant chiefly the boundary-markers that separated Jew from Gentile. N. T. Wright recast justification as a declaration of covenant membership. The movement drew vigorous replies from Reformed scholars defending the older reading.⁠³⁸ A number of Catholic scholars have noticed, with some interest, that if “works of the law” means boundary-markers and justification has an irreducibly covenantal and ecclesial dimension, the old polemic against Catholic “works-righteousness” loses much of its target—though careful Catholic voices, such as the authors of Paul, a New Covenant Jew, resist reducing Paul to sociology and insist on the reality of grace and transformation.⁠³⁹ The scholarship is alive and unsettled, and Galatians is still where the fight is joined.

There has even been a measure of reconciliation. In 1999, in Augsburg, the Catholic Church and the Lutheran World Federation signed a Joint Declaration on the Doctrine of Justification, claiming a “differentiated consensus”—an agreement on the fundamentals of justification such that the mutual condemnations of the sixteenth century no longer apply to the partner’s teaching as presented in the document. It was not a claim that all differences had vanished; the Vatican’s own earlier response had pressed hard questions, and the accord was carefully hedged. But that the two communions could stand together and say even that much, over the doctrine that had divided them for four centuries, is a quiet marvel—and the letter over which they had divided was Galatians.⁠⁴⁰

Into the Canon

Galatians needed no council to rescue it. By the time anyone drew up a formal list, its place was a foregone conclusion. It appears in the Muratorian Fragment, in the great codices, in Athanasius’s Festal Letter of 367 that first names the exact twenty-seven, in the African councils of Hippo and Carthage at the close of the fourth century, and in the Council of Trent’s definitive decree of 1546. Eusebius, cataloguing the church’s books around 325, filed it without hesitation among the homologoumena, the acknowledged writings that no one disputed.⁠⁴¹ Its road into the canon was the shortest of any book in this series, because it was never really on the road at all. It was already home.

And yet, of all the books in the New Testament, few did more to shape the canon that received it. It was the first plank of the first Christian scripture-list ever assembled, and the church had to answer that list to define its own. It was the letter over which Jerome and Augustine hammered out what it means for Scripture to be true. It was the letter that lit the Reformation and the letter from which the Council of Trent answered it. The books that nearly failed the canonical test—Second Peter, Jude, the short letters of John—tell us how the boundary of Scripture was drawn. Galatians tells us something rarer and more important: what the church thought Scripture was for. It was for cursing false gospels and guarding the true one, for insisting that the truth of the gospel cannot be traded for convenience, for holding that a man stands before God by grace through faith and not by the works of the law. The undisputed letter turns out to have been arguing, from its first line to its last, about the very thing a canon exists to protect.

Frequently Asked Questions

Was the Epistle to the Galatians ever doubted as part of the Bible? No. Galatians belongs to the small group of Pauline letters whose authenticity and canonical status were never seriously questioned in the ancient church or the modern academy. Eusebius listed it among the “acknowledged” books, and even the most radical nineteenth-century critics, who dismissed most of the New Testament as later forgery, accepted Galatians as genuinely written by Paul. Its place in the canon was never in danger.

Why did the heretic Marcion put Galatians first in his canon? Around AD 144, Marcion assembled the earliest known fixed list of Christian scriptures—a shortened Gospel of Luke and ten letters of Paul—and placed Galatians at the head of the letters. Galatians is Paul’s most forceful attack on requiring the Mosaic law of Gentile converts, and Marcion read its rejection of circumcision and its account of Paul opposing Peter as proof that the true gospel had been corrupted by Judaizing influence and that Paul alone had preserved it. The orthodox writers then had to reclaim the letter from his use of it.

Who wrote Galatians, and when? The Apostle Paul wrote it; this is one of the least disputed facts in New Testament scholarship. The date depends on where the “Galatians” lived. If Paul was writing to the churches of the southern Roman province he founded on his first journey, and before the Jerusalem Council of Acts 15, the letter could date to around AD 48–49, which would make it possibly the earliest surviving Christian document. If he was writing to the ethnic Galatians of the north, it belongs to the mid-fifties. The question turns on whether the Jerusalem meeting Paul describes in Galatians 2 is the Council of Acts 15 or the earlier famine-relief visit.

What is the argument between Paul and James about “faith alone”? Paul writes in Galatians that a person is “not justified by works of the law but through faith in Jesus Christ,” while James writes that “a person is justified by works and not by faith alone”—the only appearance of the phrase “faith alone” in the New Testament, and it is a negation. The Catholic reading, which the Council of Trent built directly into its Decree on Justification, is that the two apostles use “works” and “justify” in different senses: Paul excludes the works of the Mosaic law and all boasting from the free gift of justification, while James excludes a dead faith that never expresses itself in love. The two are complementary, not contradictory.

Why did Luther love Galatians so much? Martin Luther found in Galatians the clearest biblical statement of justification by faith apart from works of the law and of the distinction between law and gospel. His major 1535 commentary on it became a foundational Reformation text, and he is remembered in his Table Talk affectionately calling the letter his own—“my Katharina von Bora,” after his wife. Understanding what Paul actually claims in Galatians, and what the Catholic Church answered from the same six chapters at the Council of Trent, is the whole Reformation debate over justification in miniature.

What does “the law was our disciplinarian” mean in Galatians 3:24? Paul calls the Mosaic law a paidagōgos, which older translations render “schoolmaster.” That is misleading. A paidagōgos in the ancient world was not a teacher but a household slave who escorted a freeborn boy to school and supervised his conduct. Paul’s point is that the Law’s role was custodial and temporary—a guardian protecting and disciplining God’s people until the coming of Christ, after which its guardianship comes to an end. The Law is good and God-given, but it was never meant to be the permanent means of righteousness.

Footnotes

1. 1. Eusebius, Ecclesiastical History 3.25.1–2 (NPNF, 2nd ser., 1, trans. Arthur Cushman McGiffert), lists the "acknowledged" books (homologoumena); newadvent.org. Scripture quotations in this essay follow the New American Bible, Revised Edition (NABRE) unless otherwise noted; bible.usccb.org/bible/galatians.

2. 2. On Marcion (fl. c. 140–144, Rome), his truncated Gospel (Evangelion), and his ten-letter collection of Paul (the Apostolikon, excluding the Pastorals and making no use of Hebrews), see Adolf von Harnack, Marcion: Das Evangelium vom fremden Gott, 2nd ed. (Leipzig, 1924), the foundational study; and the survey in Bruce M. Metzger, The Canon of the New Testament: Its Origin, Development, and Significance (Oxford: Clarendon Press, 1987), 90–99.

3. 3. Epiphanius, Panarion 42.11.8, reports that "the letter to the Galatians stands first" in Marcion's ordering; Tertullian independently treats Galatians first in his letter-by-letter refutation in Against Marcion Book V. The order of the ten letters was Galatians, 1–2 Corinthians, Romans, 1–2 Thessalonians, "Laodiceans" (= Ephesians), Colossians, Philippians, Philemon; see Harnack, Marcion, and Metzger, Canon, 91–92.

4. 4. Tertullian, Against Marcion 5.2, in ANF 3, trans. Peter Holmes: the epistle "which we also allow to be the most decisive against Judaism, is that wherein the apostle instructs the Galatians"; newadvent.org.

5. 5. Tertullian, Against Marcion 5.1 (Marcion's Gospel prepares us "to expect to find the epistles also mutilated by him with like perverseness—and that even as respects their number") and 5.3 ("what the heretic's industry erased was the mention of Abraham's name"), ANF 3; newadvent.org. The reference is to Marcion's altered text of Galatians 3.

6. 6. Tertullian, Against Marcion 5.4, ANF 3: "Fie on Marcion's sponge!" (Latin, Erubescat spongia Marcionis). Tertullian adds that it is "superfluous to dwell on what he has erased, when he may be more effectually confuted from that which he has retained"; newadvent.org.

7. 7. The precise verse-boundaries of Marcion's omissions in Galatians are modern reconstructions from the fathers' comments, chiefly Harnack, Marcion (1924). For the methodological caution against inferring deletions from patristic silence, see Ulrich Schmid, Marcion und sein Apostolos (Berlin: de Gruyter, 1995); and, treating Marcion's readings as a witness to an early text-form, Jason BeDuhn, The First New Testament: Marcion's Scriptural Canon (Salem, OR: Polebridge, 2013).

8. 8. Galatians 1:6 (NABRE). The NABRE note observes that "in place of the usual thanksgiving... Paul, with little to be thankful for in the Galatian situation, expresses amazement." The absence of any thanksgiving section is unique among Paul's letters.

9. 9. Galatians 1:8–9 (NABRE). The NABRE note on 1:8 identifies the Greek behind "accursed" as anathema; cf. Romans 9:3; 1 Corinthians 16:22.

10. 10. Galatians 1:11–12 (NABRE).

11. 11. Galatians 1:20 (NABRE); cf. 1:18 ("after three years") and 2:1 ("after fourteen years"). On the visits, see the NABRE notes on Galatians 1:18–24 and 2:1–10.

12. 12. Galatians 2:11–14 (NABRE). The NABRE note on 2:11 renders the phrase behind "clearly was wrong" literally as "stood condemned."

13. 13. The thesis that Marcion provoked the church to define its canon is associated with Harnack, Marcion, and amplified by Hans von Campenhausen, The Formation of the Christian Bible, trans. J. A. Baker (Philadelphia: Fortress, 1972).

14. 14. For the qualification that an authoritative Pauline collection predates Marcion, see Metzger, Canon, 98–99; John Barton, Holy Writings, Sacred Text: The Canon in Early Christianity (Louisville: Westminster John Knox, 1998); and David Trobisch, Paul's Letter Collection: Tracing the Origins (Minneapolis: Fortress, 1994).

15. 15. Irenaeus, Against Heresies 3.16.3, ANF 1, trans. Roberts and Rambaut, quoting Galatians 4:4–5 against the Valentinian and Marcionite division of God; newadvent.org.

16. 16. The Muratorian Fragment, in Bruce M. Metzger, The Canon of the New Testament (Oxford: Clarendon Press, 1987), Appendix IV, 305–307; text at earlychristianwritings.com. The fragment is usually dated c. 170, though A. C. Sundberg and Geoffrey Mark Hahneman, The Muratorian Fragment and the Development of the Canon (Oxford: Clarendon Press, 1992), argue for a fourth-century Eastern origin; the traditional date is defended by Metzger, Charles E. Hill, and Joseph Verheyden.

17. 17. Polycarp, To the Philippians 5.1 (Galatians 6:7), 3.3 (Galatians 4:26), 12.2 (Galatians 1:1), and 9.2 (Galatians 2:2; the phrase overlaps Philippians 2:16), in ANF 1, trans. Roberts and Donaldson; newadvent.org. The scholarly standard text is Michael W. Holmes, The Apostolic Fathers, 3rd ed. (Grand Rapids: Baker Academic, 2007). These are allusions rather than formal citations; Polycarp's letter is usually dated c. 110–135.

18. 18. Papyrus 46 (P. Chester Beatty II; P. Mich. inv. 6238), palaeographically dated c. 175–225 (commonly "c. 200"); the leaves are divided between the Chester Beatty Library, Dublin, and the University of Michigan. The codex orders the letters Romans, Hebrews, 1–2 Corinthians, Ephesians, Galatians, Philippians, Colossians, 1 Thessalonians. The much earlier date of c. AD 80 proposed by Y. K. Kim (1988) is generally rejected.

19. 19. 2 Peter 3:15–16 (NABRE). Whatever the date of 2 Peter, the passage attests that Paul's letters circulated as a known collection and were ranked among "the scriptures." See the companion essay, 2 Peter—The Most Contested Letter in the Canon.

20. 20. Galatians 6:11 (NABRE). On the undisputed Pauline letters and F. C. Baur's four Hauptbriefe (Romans, 1–2 Corinthians, Galatians), see the standard treatments of Pauline authorship; Baur (1792–1860) rejected the other ten letters as later products of the Petrine–Pauline conflict.

21. 21. For the North Galatian theory, J. B. Lightfoot, St Paul's Epistle to the Galatians (London, 1865); for the South Galatian theory, W. M. Ramsay, The Church in the Roman Empire before A.D. 170 (1893) and A Historical Commentary on St Paul's Epistle to the Galatians (1899). F. F. Bruce, The Epistle to the Galatians, NIGTC (Grand Rapids: Eerdmans, 1982), defends the South Galatian view.

22. 22. On the identification of Galatians 2:1–10 with the famine-relief visit of Acts 11:30 rather than the Council of Acts 15, and the resulting early date (c. AD 48–49), see Bruce, Galatians, NIGTC. The argument from silence—Paul never cites the Council's decree, which would have settled his case—is the strongest evidence for a pre-Council date. The NABRE note on Galatians 2:1–10 records the mainstream identification with Acts 15 while noting "the 'decree' that Paul does not mention."

23. 23. Galatians 1:7; 5:10; 3:1 (NABRE). Paul's verb is tarassō, "to trouble, agitate." The English group-name "Judaizers" is a later coinage; Paul uses the verb "to Judaize" (ioudaïzein) once, at 2:14, of compelling Gentiles to live like Jews. Modern scholarship, especially after E. P. Sanders, cautions against the term as a caricature of Second Temple Judaism.

24. 24. Galatians 2:16 (NABRE): "not justified by works of the law but through faith in Jesus Christ, even we have believed in Christ Jesus that we may be justified by faith in Christ and not by works of the law."

25. 25. On "works of the law" (erga nomou) as covenant boundary-markers, see James D. G. Dunn, "The New Perspective on Paul," Bulletin of the John Rylands Library 65 (1983): 95–122. On the pistis Christou question—whether the genitive means "faith in Christ" (objective; so Dunn) or "the faithfulness of Christ" (subjective; so Richard B. Hays, The Faith of Jesus Christ, 1983)—the debate remains unresolved.

26. 26. Galatians 3:24–25 (NABRE). The NABRE note on 3:24–25 explains that the Greek paidagōgos "referred to a slave who escorted a child to school but did not teach or tutor; hence, a guardian or monitor." The King James "schoolmaster" is misleading.

27. 27. Galatians 3:28 (NABRE). The verse's primary force in context concerns who may be counted heirs of Abraham (3:29); the NABRE note calls 3:27–28 "likely a formula used at baptism that expresses racial, social-economic, and sexual equality in Christ."

28. 28. Galatians 4:21–31 (NABRE); Paul's own word at 4:24 is allēgoroumena, "this is an allegory." On the spiritual senses of Scripture, see Catechism of the Catholic Church 115–118; vatican.va. Many modern exegetes describe Paul's move as typology rather than allegory in the later technical sense.

29. 29. Galatians 5:6 (NABRE): "faith working through love." The NABRE note allows the rendering "faith energized by (God's) love." This is the classic scriptural ground for the Catholic doctrine of fides caritate formata, faith formed by charity.

30. 30. On the ancient commentaries: Stephen A. Cooper, Marius Victorinus' Commentary on Galatians, Oxford Early Christian Studies (Oxford: Oxford University Press, 2005), the earliest surviving Latin commentary on Paul; John Chrysostom, Commentary on Galatians, in NPNF, 1st ser., 13 (a continuous commentary, unusual for him); Andrew Cain, St. Jerome: Commentary on Galatians, Fathers of the Church 121 (Washington, DC: Catholic University of America Press, 2010); Eric Plumer, Augustine's Commentary on Galatians, Oxford Early Christian Studies (Oxford: Oxford University Press, 2003); with commentaries also by Ambrosiaster, Theodore of Mopsuestia, and Pelagius.

31. 31. Jerome advanced the "feigned dispute" reading in his Commentary on Galatians (c. 386), following Origen; he restated it in Letter 75 (= Jerome, Ep. 112) 9, NPNF, 1st ser., 1: Peter "was thoroughly aware of the abrogation of the law of Moses, but was compelled by fear to pretend to observe it"; newadvent.org.

32. 32. Augustine, Letter 28 (to Jerome, A.D. 394/395), 3.3, NPNF, 1st ser., 1, trans. J. G. Cunningham; newadvent.org. Augustine opens: "In reading your exposition of the Epistle to the Galatians, that passage came to my hand in which the Apostle Peter is called back from a course of dangerous dissimulation."

33. 33. The exchange continued in Augustine's Letters 40 and 82 and Jerome's Letter 75; Augustine's insistence on the plain truthfulness of the narrative prevailed and drives his later treatise On Lying (De mendacio). See the Augustine–Jerome correspondence in NPNF, 1st ser., 1; newadvent.org.

34. 34. The remark is preserved in Luther's Table Talk (WA, Tischreden 1, no. 146); the familiar English "my Katharina von Bora" is a loose rendering of the German. Luther's major commentary is the Lectures on Galatians (1535), from lectures of 1531, in Luther's Works (American Edition), vols. 26–27; an earlier commentary appeared in 1519.

35. 35. Galatians 2:20 (NABRE); cf. 2:16 and 3:13 (Christ "ransomed us from the curse of the law by becoming a curse for us").

36. 36. Council of Trent, Session VI (13 January 1547), Decree on Justification, ch. 7 (grounding faith formed by charity in Galatians 5:6, "faith that worketh by charity," with Galatians 6:15) and Canon 9, trans. James Waterworth (London, 1848); papalencyclicals.net. The canons are Denzinger–Hünermann 1551–1583.

37. 37. James 2:24 (NABRE) is the only New Testament text conjoining "faith" and "alone" (Greek monon), and it does so in the negative; the monon is grammatically adverbial ("not by faith only"). Trent's Decree on Justification, ch. 10, cites James 2 directly. On Luther's "epistle of straw," see The Epistle of James—Faith, Works, and the Letter Luther Called "Straw."

38. 38. E. P. Sanders, Paul and Palestinian Judaism (Philadelphia: Fortress, 1977); James D. G. Dunn, "The New Perspective on Paul" (Manson Memorial Lecture, 1982; published 1983), which popularized a label N. T. Wright had used earlier in "The Paul of History and the Apostle of Faith," Tyndale Bulletin 29 (1978): 61–88; N. T. Wright, What St Paul Really Said (Grand Rapids: Eerdmans, 1997) and Justification: God's Plan and Paul's Vision (Downers Grove: IVP, 2009). For the Reformed reply, D. A. Carson, Peter T. O'Brien, and Mark A. Seifrid, eds., Justification and Variegated Nomism, 2 vols. (2001, 2004); John Piper, The Future of Justification: A Response to N. T. Wright (Wheaton: Crossway, 2007).

39. 39. Brant Pitre, Michael P. Barber, and John A. Kincaid, Paul, a New Covenant Jew: Rethinking Pauline Theology (Grand Rapids: Eerdmans, 2019); see also Taylor Marshall, The Catholic Perspective on Paul (2010).

40. 40. Joint Declaration on the Doctrine of Justification, signed by the Lutheran World Federation and the Catholic Church at Augsburg, 31 October 1999; vatican.va. The accord claims a "differentiated consensus"; the Catholic Church's earlier Response (25 June 1998) and the 1999 Annex record the remaining questions.

41. 41. Athanasius, Festal Letter 39 (AD 367); Councils of Hippo (393) and Carthage (397); Council of Trent, Session IV (8 April 1546), Decree Concerning the Canonical Scriptures (Denzinger–Hünermann 1502–1503); Eusebius, Ecclesiastical History 3.25 (NPNF, 2nd ser., 1), which files Paul's letters among the homologoumena; newadvent.org.