Augustine of Hippo : It is written in the epistle to the Hebrews, "Through faith also Sarah herself received strength to conceive seed." For both were old, as the Scripture testifies; but she was also barren and had ceased to menstruate, so that she could no longer bear children even if she had not been barren. Further, if a woman is advanced in years yet still retains the custom of women, she can bear children to a young man but not to an old man, although that same old man can beget, but only of a young woman; as after Sarah's death Abraham could of Keturah, because he met with her in her lively age. This, then, is what the apostle mentions as wonderful, saying, besides, that Abraham's body was now dead; because at that age he was no longer able to beget children of any woman who retained now only a small part of her natural vigor. Of course we must understand that his body was dead only to some purposes, not to all; for if it was so to all, it would no longer be the aged body of a living man but the corpse of a dead one. Although that question, how Abraham begot children of Keturah, is usually solved in this way, that the gift of begetting which he received from the Lord remained even after the death of his wife. Yet I think that solution of the question which I have followed is preferable, because, although in our days an old man of a hundred years can beget children of no woman, it was not so then, when men still lived so long that a hundred years did not yet bring on them the decrepitude of old age. — City of God 16.28 Cyril of Jerusalem : There is much to tell of faith, and the whole day would not be enough time for us to describe it fully. At present let us be content with Abraham only, as one of the examples from the Old Testament, seeing that we have been made his sons through faith. He was justified not only by works but also by faith: for though he did many things well, yet he was never called the friend of God except when he believed. Moreover, his every work was performed in faith. Through faith he left his parents, left country and place and home through faith. Therefore, you too should be justified in the same way he was justified. In his body he was already dead in regard to offspring, and Sarah his wife was now old, and there was no hope left of having children. God promises the old man a child, and Abraham, "without being weakened in faith, though he considered his own body now as good as dead," did not look at the weakness of his body but at the power of him who promised because "he counted him faithful who had promised." And so, beyond all expectation, [Abraham] gained the child from bodies already dead, as it were. And when, after he had gained his son, he was commanded to offer him up, although he had heard the word, "In Isaac shall your seed be called," he proceeded to offer up his son, his only son, to God, believing "that God is able to raise up even from the dead." And having bound his son and laid him on the wood, he did in purpose offer him. But he received his son alive through the goodness of God in delivering to him a lamb instead of his child. Being faithful in these things, he was sealed for righteousness "and received circumcision as a seal of the faith which he had while he was in uncircumcision, having received a promise that he should be the father of many nations." — Catechetical Lecture 5:5 Cyril of Jerusalem : Let us see, then, how Abraham is the father of many nations. Of Jews he is confessedly the father, through succession according to the flesh. But if we hold to the succession according to the flesh, we shall be compelled to say that the oracle was false. For according to the flesh he is no longer father of us all: but the example of his faith makes us all sons of Abraham. How and in what manner? With people it is incredible that one should rise from the dead, just as it is also incredible that there should be offspring from aged persons who are as good as dead. But when Christ is preached as having been crucified on the tree, and as having died and risen again, we believe it. By the likeness therefore of our faith we are adopted into the sonship of Abraham. And then, following upon our faith, we receive like him the spiritual seal, being circumcised by the Holy Spirit through baptism, not in the foreskin of the body but in the heart, according to Jeremiah, where he says, "And you shall be circumcised unto God in the foreskin of your heart," and according to the apostle, "in the circumcision of Christ, having been buried with him in baptism," and the rest. — Catechetical Lecture 5:6 Ephrem the Syrian : "By faith Sarah herself received power to conceive, even when she was past the age." She, who was barren gave birth—that is, received the powers and youth that were necessary for conception and bearing—even though her old age was unable to cope with these things. And all this happened to her because, in the midst of the pagan Canaanites, she "considered him faithful who had promised" to give her these things. — COMMENTARY ON THE EPISTLE TO THE HEBREWS Gregory of Nyssa : Let him therefore wait for that time which is necessarily made co-extensive with the development of humanity. For even Abraham and the patriarchs, while they had the desire to see the promised good things, and ceased not to seek the heavenly country, as the apostle says, are yet even now in the condition of hoping for that grace, "God having provided some better thing for us," according to the words of Paul, "that they without us should not be made perfect." If they, then, bear the delay who by faith only and by hope saw the good things "afar off" and "embraced them," as the apostle bears witness, placing their certainty of the enjoyment of the things for which they hoped in the fact that they "judged Him faithful Who has promised," what ought most of us to do, who have not, it may be, a hold upon the better hope from the character of our lives? Even the prophet's soul fainted with desire, and in his psalm he confesses this passionate love, saying that his "soul hath a desire and longing to be in the courts of the Lord," even if he must needs be rejected to a place amongst the lowest, as it is a greater and more desirable thing to be last there than to be first among the ungodly tents of this life; nevertheless he was patient of the delay, deeming, indeed, the life there blessed, and accounting a brief participation in it more desirable than "thousands" of time—for he says, "one day in Thy courts is better than thousands"—yet he did not repine at the necessary dispensation concerning existing things, and thought it sufficient bliss for man to have those good things even by way of hope; wherefore he says at the end of the Psalm, "O Lord of hosts, blessed is the man that hopeth in Thee." — ON THE MAKING OF MAN 22.7 John Chrysostom : "By faith also Sarah herself," he says. Here he began speaking in a way to put them to shame, in case, that is, they should show themselves more faint-hearted than a woman. But possibly some one might say, How "by faith," when she laughed? Nay, while her laughter indeed was from unbelief, her fear was from Faith, for to say, "I laughed not," arose from Faith. From this then it appears that when unbelief had been cleared out, Faith came in its place. "By faith also Sarah received strength to conceive seed even when she was past age." What is, "to conceive seed"? She who was become dead, who was barren, received power for the retaining of seed, for conception. For her imperfection was two-fold; first from her time of life for she was really old; secondly from nature, for she was barren. — Homily on Hebrews 23 Oecumenius : "By faith, Sarah herself also." It is a challenge that even Sarah herself, as if to say: If a woman has believed, it is a shame if we are found to be of less faith than a woman. But how did she believe? And yet she laughed. But afterwards she was afraid when rebuked, which is what faith is. "received strength to conceive seed." For the reception of the seed, that is to say, she was strengthened to receive the seed that produces children. "and she bore a child when she was past the age." This, too, means not only, he says, that she was barren, but also that beyond the proper age, that is to say, in her very old age, she was strengthened to receive the seed. "because she considered Him faithful." Faithful, that is, truthful. But where did he promise? According to this time, he says, I will come, and there will be a son for Sarah. "Therefore, from one man." Therefore, all who are of the seed of Abraham were born from one seed, and because of the age, they are as numerous as the stars of heaven and the sand of the sea. — The Pseudo-Oecumenian Catena on Hebrews Theodoret of Cyrus : "From one person" means from Abraham; but if we were to take the "one" to mean both of them [Abraham and Sarah], we would not be wide of the mark: "the two will be one flesh," Scripture says. — INTERPRETATION OF Hebrews 11