Jerome, on Gal 3:7

“Know ye therefore, that they who are of faith, the same are the children of Abraham.”

“(V.7) So you know, those who are of faith, these are the children of Abraham. He discusses more fully in the letter to the Romans that faith was reckoned to Abraham as righteousness, not in circumcision but in uncircumcision (Rom. 4). And carefully observing, he teaches that those who believed with this mindset are the children of Abraham, just as Abraham believed when he was uncircumcised, who rejoiced to see the day of the Lord, and saw it and was glad (John 8). And it is also said to the unbelieving Jews: If you were children of Abraham, you would do the works of Abraham (Ibid. 39). But what other works was the Lord seeking from them at that time when these things were said, except faith in the Son of God, whom the Father had sent to speak: Whoever believes in me, does not believe in me, but in him who sent me (John XII, 44)? And in another place, when they were clapping and boasting about their ancient and noble lineage, the response is given: And do not say, 'We have Abraham as our father.' For God is able to raise up children to Abraham from these stones (Matth. III, 9). By these stones, no one doubts that the hardened hearts of the Gentiles are signified, which were later softened and received the seal of faith. Enumerate the virtues of Abraham in which he pleased God before circumcision, diligent reader, and wherever you find them in a similar work, say that they are the children of Abraham, justified in the foreskin, who received circumcision not because of the merit of works, but as a sign of prior faith. For indeed Christ was to be born from his seed (in whom the blessing of all nations was promised, and from Abraham until Christ many centuries were to pass), God foreseen that the children of beloved Abraham might mix with other nations, and gradually his family would become uncertain, he marked the Israelite flock with a certain circumcision seal, so that they would be distinguished by this sign while living among the Egyptians, Assyrians, Babylonians, and Chaldeans. Finally, for forty years in the desert, no one was circumcised: for they alone lived without the mixture of another nation. As soon as the people crossed the banks of the Jordan and poured themselves into the land of Palestine, the circumcision, necessary for the future mix of nations, guarded against error. And that which is written a second time about the circumcised people (Joshua 5) signifies that the circumcision ceased in the desert, which was reasonably practiced in Egypt; and that believers are to be cleansed by the spiritual circumcision of the Lord Jesus Christ.”

Imported from an open dataset — not yet checked against the printed edition.