One gospel, and no room for a second
Paul opens with the sharpest sentence in his correspondence. Anyone preaching another gospel is under a curse, and he includes himself and any angel in the condemnation: 'though we, or an angel from heaven, should preach unto you any gospel other than that which we preached unto you, let him be anathema' (1:8). He repeats it in the next verse so nobody can put it down to temper. What is at stake is the source of the message, which is why the first two chapters are autobiography. He did not receive it from an apostle: 'neither did I receive it from man, nor was I taught it, but it came to me through revelation of Jesus Christ' (1:12). He was in Arabia and Damascus for three years before he saw Cephas at all (1:17-18), and even then he saw no other apostle, 'save James the Lord’s brother' (1:19). The argument is that the gospel he preached in Galatia has no human editor to appeal to over his head.
Galatians 1:6 · Galatians 1:8 · Galatians 1:12
A man is justified by faith in Jesus Christ
The letter's central sentence is put as something Paul and Peter already agreed on before the argument started: 'knowing that a man is not justified by the works of the law but through faith in Jesus Christ, even we believed on Christ Jesus, that we might be justified by faith in Christ, and not by the works of the law: because by the works of the law shall no flesh be justified' (2:16). The word for justified is a courtroom word, the verdict a judge returns, and Paul insists the verdict is given on the ground of Christ rather than earned by performance. He states the alternative bluntly at 2:21, 'if righteousness is through the law, then Christ died for nought'. Then he calls Habakkuk as his witness, 'The righteous shall live by faith' (3:11), a line that would move Luther five hundred years later and that Paul uses in Romans as well.
Galatians 2:16 · Galatians 2:21 · Galatians 3:11
Abraham got there first, and the promise came first
Paul answers the appeal to Moses by going back further. Abraham was reckoned righteous before circumcision and before Sinai: 'Even as Abraham believed God, and it was reckoned unto him for righteousness' (3:6), which makes 'they that are of faith, the same are sons of Abraham' (3:7). He goes on to say that the promise to Abraham was the gospel in advance, since 'the scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand unto Abraham' (3:8). Then the chronology does the work. A covenant already confirmed cannot be cancelled by a later document, and 'the law, which came four hundred and thirty years after, doth not disannul, so as to make the promise of none effect' (3:17). Gentile believers are brought into a promise God made to Abraham, so 'if ye are Christ’s, then are ye Abraham’s seed, heirs according to promise' (3:29).
Galatians 3:6 · Galatians 3:8 · Galatians 3:17 · Galatians 3:29
What the law was for, and what it could never do
Paul asks his own question at 3:19, 'What then is the law?', and the answer he gives assigns it a real office in God's own plan. It was 'added because of transgressions, till the seed should come to whom the promise hath been made' (3:19), it kept its charges in custody, 'we were kept in ward under the law' (3:23), and it had a job with an end date: 'the law is become our tutor to bring us unto Christ, that we might be justified by faith' (3:24), 'But now that faith is come, we are no longer under a tutor' (3:25). The tutor of that image is a household slave who walked a boy to school and kept him out of trouble on the way, an office held in trust for a fixed season and laid down when the boy came of age. What follows is the point the whole argument was built for: 'ye are all sons of God, through faith, in Christ Jesus' (3:26), and 'There can be neither Jew nor Greek, there can be neither bond nor free, there can be no male and female; for ye all are one man in Christ Jesus' (3:28).
Galatians 3:19 · Galatians 3:24 · Galatians 3:26 · Galatians 3:28
Sons, heirs, and the Spirit who says Abba
Chapter 4 turns the legal argument into a family one. God waited for a moment of his own choosing: 'when the fulness of the time came, God sent forth his Son, born of a woman, born under the law' (4:4), and the purpose is stated in the next line, 'that he might redeem them that were under the law, that we might receive the adoption of sons' (4:5). Then a second sending, matching the first: 'because ye are sons, God sent forth the Spirit of his Son into our hearts, crying, Abba, Father' (4:6). Abba is Aramaic, the word a child used at home, and Paul leaves it untranslated in a letter to Greek-speaking Gentiles because it is the word the Spirit puts in their mouths. The result is a change of legal standing that can be stated in one line: 'thou art no longer a bondservant, but a son; and if a son, then an heir through God' (4:7). Going back to the old arrangement is described as turning 'back again to the weak and beggarly rudiments' (4:9).
Galatians 4:4 · Galatians 4:6 · Galatians 4:7
Freedom, the Spirit, and the fruit that grows
The last two chapters answer the obvious objection, that a gospel without law will produce people who do as they please. Paul agrees that freedom can be abused and rules the abuse out in the same sentence he grants the freedom: 'ye, brethren, were called for freedom; only use not your freedom for an occasion to the flesh, but through love be servants one to another' (5:13). His summary of the law is Leviticus, 'Thou shalt love thy neighbor as thyself' (5:14). The engine is the Spirit rather than a rule sheet, 'Walk by the Spirit, and ye shall not fulfil the lust of the flesh' (5:16), with a real conflict inside the believer, 'the flesh lusteth against the Spirit, and the Spirit against the flesh' (5:17). What the Spirit produces is described as one fruit with nine parts, 'love, joy, peace, longsuffering, kindness, goodness, faithfulness' (5:22), 'meekness, self-control; against such there is no law' (5:23). The same Spirit had been supplying the Galatians and working miracles among them while they were being told they needed something more (3:5), and Paul's whole appeal rests on their memory of it.
Galatians 5:1 · Galatians 5:13 · Galatians 5:22 · Galatians 5:23