Pelagius — on Rom 9:10 (PELAGIUS'S COMMENTARY ON ROMANS)

“Not only are Ishmael and Isaac (who were born of different mothers but the same father) not equal in the sight of God; Jacob and Esau too (who were born of Rebecca by a single conception), were separated in God's sight before they were born, because of their future faith, so that God's plan to choose the good and reject the evil already existed in his foreknowledge. Thus God has now chosen from among the Gentiles those whom he foreknew would believe and has rejected those of Israel whom he foreknew would not believe. Rebecca is thought to have been the first woman to have borne twins; it is because this strange thing has happened to her that she inquires of God.”