What is the context?
Paul addresses those who want to be under the law by asking them to listen to what it says. He turns to Abraham’s family in Genesis 16 and Genesis 21: one son was born to Hagar, a slave woman, and the other to Sarah, a free woman. Paul contrasts birth according to the flesh with birth through God’s promise.
He then explains the comparison he is making. The women represent two covenants. Hagar corresponds to Mount Sinai and the present Jerusalem, which he describes as in slavery with her children. The Jerusalem above is free and is the mother of those he addresses.
Paul brings in Isaiah 54:1, where a barren woman is called to rejoice over the many children she will have. He applies this promise-shaped picture to the Galatians: like Isaac, they are children of promise.
The comparison also addresses opposition. Paul says that the son born according to the flesh persecuted the son born according to the Spirit, and that something similar is happening now. He then cites the expulsion of Hagar and her son to explain that the inheritance does not pass through the slave woman’s son.
His conclusion prepares for the next chapter’s call to stand in freedom. The Galatians belong with the free woman. The comparison challenges their wish to place themselves under the law after receiving the promise through Christ.
How is this passage commonly understood?
Wesley’s notes on verses 21–31 and the USCCB notes on verses 21–31 both read Paul’s comparison as supporting his earlier teaching about promise and freedom. They connect the inheritance with God’s promise and understand the Galatians to be included among its children.
The comparison follows the connections Paul himself identifies in this passage. It does not require treating every detail of Abraham’s family as a hidden code, and it gives no basis for treating Jewish people with contempt.
Where does this fit in God's plan?
Paul explicitly brings Isaiah 54:1 into this account. In its wider setting, verses 1–10 promise renewed life, an expanding family and God’s enduring compassion to a woman pictured as desolate. Paul uses its opening promise to help explain the family God is bringing into being.
Hebrews 12:18–24 also sets Sinai alongside the heavenly Jerusalem. It describes believers approaching that city, the gathered people of God, and Jesus, the mediator of a new covenant. This is an explicit New Testament connection between the heavenly city and the welcome made possible through Jesus.
Together these passages place Paul’s family comparison within the larger hope of God gathering His people through His promise and His Son. The connections are stated in Scripture; they do not depend on inventing an additional meaning for every person or place in the Genesis account.
What is our position?
We don't have a position on this passage yet. When our study reaches a conclusion the text supports, it will appear here.