Augustine of Hippo : And He promised his seed, what? In your seed all nations will be blessed. His seed is Christ: because from Abraham Isaac, from Isaac Jacob, from Jacob the twelve, from the twelve the people of the Jews, from the people of the Jews the virgin Mary, from the virgin Mary our Lord Jesus Christ. And our Lord Jesus Christ became the seed of Abraham; and what was promised to Abraham we find fulfilled in us. In your seed, He says, all nations will be blessed. He believed this before he had seen anything; he believed, and he did not see what was promised. But we see what was promised to him; and whatever was promised to him was in the future. — Sermon 113A Bede : And in your seed all the families of the earth shall be blessed. The seed of Abraham is indeed Christ, in whose faith the blessing was promised to all the families of the earth, that is, to Jews and Gentiles alike. The apostle soothes the minds of the Jews to make them more prompt to believe, saying that the Healer of the whole world chose to visit and bless them first. — Commentary on Acts Bede : Saying to Abraham: And in your seed all the families of the earth shall be blessed. From both this testimony, namely that which was given to Moses, and that which was proclaimed to Abraham by the Lord, both his severity and goodness are shown: goodness indeed in those who, having received faith in Christ, deserve to be blessed by him; severity, however, in those who, due to their own contempt and disobedience, are exterminated from the people of the blessed, that is, cast out beyond the boundaries of eternal happiness. But it was said: In your seed all the families of the earth shall be blessed, just as it was said in the Gospel: He was the true light which enlightens every man coming into the world (John I). For not all the families of the earth are blessed in Christ, nor is every man coming into the world enlightened by Christ, since many are those who, living in the darkness and curse in which they were born due to the first transgression, or even adding worse deeds, are damned to eternity. But it must be understood that in the seed of Abraham, that is, in Christ, all the families of the earth who are to be blessed are blessed; and by his grace, every man who belongs to the lot of the saints, which is in light, is enlightened: nor is there another name under heaven given to men in which we must be saved (Acts IV). Although it can also rightly be understood in this way, that there is no clan or family of the earth in which some do not receive the blessing of the heavenly inheritance: I speak of those families, or clans of seventy-two, into which the human race was divided after the flood in the construction of the tower. Therefore, in the seed of Abraham, namely the Mediator of God and men, the man Jesus Christ, all the chosen are blessed, not only those who believed in him after his Incarnation, but also those who, being born in the flesh, preceded the times of his Incarnation. For to all the same man God, ascending to the heavens, opened the gates of the heavenly kingdom, to all he will say on the day of judgment: Come, blessed of my Father, receive the kingdom (Matthew XXV). — Retractions on Acts John Chrysostom : "Ye are the children of the prophets": so that to you they spake, and for your sakes have all these things come to pass. For as they deemed that through their outrage they had become alienated (and indeed there is no parity of reason, that He Who now is crucified, should now cherish them as His own), he proves to them that both the one and the other are in accordance with prophecy. "Ye are the children," he says, "of the Prophets, and of the covenant which God made with our fathers, saying unto Abraham, 'And in thy seed shall all the kindreds of the earth be blessed.'" — Homily on Acts 9 John Chrysostom : "Ye," he says, "are the children of the Prophets, and of the covenant which God made." "Children of the covenant;" that is, heirs. For lest they should think that they received this offer from the favor of Peter, he shows, that of old it was due to them, in order that they may the rather believe that such also is the will of God. — Homily on Acts 9 John Chrysostom : Then also, on the other hand, he says, as matter of encomium (so that for this reason also ye ought to obey): "Ye are the children of the prophets and of the covenant:" i.e. heirs. Then why do you stand affected towards that which is your own, as if it were another's? True, you have done deeds worthy of condemnation; still you may yet obtain pardon. — Homily on Acts 9 Oecumenius : "You are the descendants of the prophets," instead of, Do not be discouraged nor think yourselves alienated from the promises. You are the descendants of the prophets, as I was telling you, and through you these things have come to pass. "You," he says, "are the descendants of the prophets," but this one is the Son of God, sharing the Father in essence, and giving himself to them as well. "You are the descendants of the prophets and of the covenant." Descendants, instead of heirs. For if a descendant, then also an heir; and heirs not recently enrolled, but as descendants; and that he may show how much from adoption, if indeed they themselves also will, they too are heirs as descendants; therefore he sent the Son as a Son, "He sent" indeed also to others, but to you first; and not only that, but first, as it were, before those who crucified and killed him. And when? Not only now, but also before the cross, and before so great an attempt, and after the resurrection. Therefore he says, "Having raised him for you first." What is the purpose? To bless and save you, if then you yourselves would choose to turn away from your wickedness. — Commentary on Acts