“But when the fullness of time had come, God sent forth his Son, born of woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons.”
— Galatians 4:4-5
Context & Key Themes
Chapter 4 continues the theological argument of chapter 3 and draws it toward its practical climax. Paul extends the paidagogos image into the fuller Roman legal picture of an heir who, though destined to inherit the father’s entire estate, lives under guardians and stewards during his minority and is, in every practical sense, indistinguishable from a slave during that period. The coming of Christ, Paul argues, marks the end of the minority. The heir has come of age. The guardianship is finished. The inheritance is now directly accessible. To return to the guardians after the heir has come into his inheritance is not piety. It is regression.
The chapter then moves through the fullness-of-time passage (verses 4-7), one of the most compact statements of redemption in the New Testament, and into the pastoral grief section where Paul shifts from argument to pleading. He remembers the first time he preached to the Galatians — how they received him despite some physical ailment that made him unimpressive or difficult to receive, how they would have plucked out their own eyes and given them to him. And he laments the change. Where once they welcomed him as a messenger of God, now, because he tells them the truth, they treat him as an enemy.
The chapter closes with the Hagar and Sarah allegory, which has sometimes troubled readers because Paul explicitly names it as allegoroumena — being spoken allegorically. Paul is not denying the historical reality of Genesis. He is saying that the two women of Abraham’s household correspond typologically to two covenants, and the Galatians’ choice between law-keeping and faith is, in effect, a choice between which mother to belong to. Those who insist on continuing under the law are children of the slave woman. Those who trust Christ are children of the free woman, heirs of the promise.
Summary
Paul opens with the legal analogy. The heir, as long as he is a child, is no different from a slave, though he is the owner of everything. He is under guardians and stewards until the date set by his father. In the same way, he says, we also, when we were children, were enslaved to the stoicheia tou kosmou — the elemental principles of the world, a phrase that in this context refers to the whole system of religious observance (the law for Jews, various pagan observances for Gentiles) under which human beings lived before Christ came. But when the fullness of time had come, God sent forth his Son, born of woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons. And because we are sons, God has sent the Spirit of his Son into our hearts, crying Abba! Father! So we are no longer slaves but sons, and if sons, then heirs through God.
Paul then turns the point toward the Galatians directly. Formerly, when they did not know God, they were enslaved to those that by nature are not gods. But now that they have come to know God — or rather to be known by God — how can they turn back again to the weak and worthless elementary principles, whose slaves they want to be once more? They are observing days and months and seasons and years — a reference to the Jewish religious calendar the opponents were urging on them — and Paul fears he has labored over them in vain.
He shifts from argument to plea. He became like them when he preached to them; he asks them to become like him. They have done him no wrong. They know that it was because of a bodily ailment that he preached the gospel to them the first time, and though his condition was a trial to them, they did not scorn or despise him, but received him as an angel of God, as Christ Jesus. What has become of that blessedness they felt? He testifies that if possible they would have gouged out their own eyes and given them to him. Have they now become his enemy by telling them the truth? The opponents, Paul says, make much of the Galatians, but not for a good purpose — they want to shut the Galatians out so that the Galatians will make much of them instead. It is always good to be made much of for a good purpose, Paul notes, and not only when he is present with them. He calls them my little children, for whom he is again in the anguish of childbirth until Christ is formed in them. He wishes he were present with them now and could change his tone, for he is perplexed about them.
Paul then turns to the allegory. Tell me, he says to those who desire to be under the law, do you not listen to the law? Abraham had two sons, one by the slave woman and one by the free woman. The son of the slave was born according to the flesh; the son of the free woman through promise. This may be spoken allegorically, Paul says — using the verb allegoroumena, which indicates he is reading the story as carrying a typological meaning in addition to its historical reality. The two women correspond to two covenants. One is from Mount Sinai, bearing children for slavery — this is Hagar. Hagar corresponds, Paul says, to the present Jerusalem, which is in slavery with her children. But the Jerusalem above is free, and she is our mother. Paul quotes Isaiah 54: Rejoice, O barren one who does not bear; break forth and cry aloud, you who are not in labor, for the children of the desolate one will be more than those of the one who has a husband. The believers, Paul declares, are like Isaac — children of promise. But just as at that time the one born according to the flesh persecuted the one born according to the Spirit, so also it is now. What does the scripture say? Cast out the slave woman and her son, for the son of the slave woman shall not inherit with the son of the free woman. The Galatians, then, are children not of the slave but of the free.
Reflection
The fullness-of-time passage compresses the entire history of salvation into a few clauses. Before Christ, humanity was in the position of heirs who were still minors, unable to access the inheritance, under various forms of guardianship. When the time was right — Paul uses the word pleroma, fullness, the moment when all the necessary conditions were present — God sent his Son. Two descriptions follow, deliberately balanced. Born of woman: fully human, entering the human story through the normal process of human birth. Born under the law: fully subject to the Mosaic covenant, a Jew keeping the Torah without exemption. Both phrases matter. The Son had to be fully human to redeem humanity, and he had to stand fully under the law in order to absorb its curse on behalf of those under it. The purpose of both clauses is stated in the next verse: to redeem those who were under the law, so that we might receive adoption as sons. Christ fulfilled the law perfectly and then died under its curse for those who had broken it, so that they could be adopted as sons and daughters of the Father whose Son Christ eternally is.
The Abba cry in verse 6 deserves to be held at its full weight. The Aramaic word abba is an intimate family word — closer to papa or father dear than to the formal father an adult son might use in public. It was the way Jesus himself addressed the Father in Gethsemane, and its preservation in Aramaic within Greek-language New Testament texts is one of the strongest pieces of evidence that the earliest church remembered the specific vocabulary of Jesus’s own prayer life. Paul is telling the Galatians that the Spirit of the Son is within them, crying the same word the Son himself cried to the Father. They are not petitioners hoping for access. They are children already in the Father’s presence, using the word children use for the father who is their father.
The pastoral grief passage in verses 12-20 is one of the rawest in all of Paul’s letters. Paul reminds them of their earlier warmth toward him, when his physical weakness — likely the same unnamed affliction that 2 Corinthians will later call his thorn — made him easy to despise, and yet they received him as an angel of God. That welcome is gone. Now he is treated as an enemy for telling them the truth. The pain is not Paul’s primary concern; the concern is that the relationship that made his earlier ministry fruitful has been damaged, and with it the trust that could have kept the Galatians from wandering. The image of labor pains in verse 19 is deliberately female — Paul, a man, uses the image of childbirth to describe what it costs to form Christ in a congregation that has slipped backward. It cost him the first time. It is costing him again. And it is costing him twice as much, because the second labor is for the same children.
The Hagar-Sarah allegory has sometimes been mishandled in ways Paul did not intend. Paul is not saying that the historical Hagar or her descendants are cursed, or that ethnic Israel is the slave-woman’s line while Gentile Christians are the free-woman’s line. He is reading two covenantal principles through two biblical figures. The Sinai covenant, approached as a means of justification, produces slavery — like the slave woman’s son, a child of human effort rather than divine promise. The Abrahamic covenant, received by faith, produces freedom — like Isaac, whose birth was miraculous rather than achieved. The Galatians are being asked to choose which mother they belong to, and the answer is determined by whether they trust Christ or trust their own law-keeping. Jews who believe in Christ are part of the free line along with believing Gentiles. Gentiles who abandon Christ for law-keeping are moving themselves toward the slave line along with law-trusting Jews. The division is not ethnic. It is the division between faith and works, between promise and flesh, between the Jerusalem above and the present Jerusalem of Paul’s own day.
And the closing citation from Genesis — cast out the slave woman and her son — applied to the opponents, is as sharp as anything Paul has yet said. The Judaizers are not simply mistaken teachers whose views happen to differ from Paul’s. They are, in Paul’s reading of the typology, the Ishmael figures who persecute the Isaac line and must be cast out of the household. Paul is not calling for violence. He is telling the Galatians that the opponents’ influence cannot coexist with Isaac’s inheritance. One of the two must go. The free woman’s son inherits; the slave woman’s son does not. The choice is the Galatians’ to make, and the urgency of the letter is Paul’s attempt to make sure they make the right one before it is too late.