Genesis 21:10

“How then,” said I, “does the one of the three, who was in the tent, and who said, ‘I shall return to thee hereafter, and Sarah shall have a son,’ appear to have returned when Sarah had begotten a son, and to be there declared, by the prophetic word, God? But that you may clearly discern what I say, listen to the words expressly employed by Moses; they are these: ‘And Sarah saw the son of Hagar the Egyptian bond-woman, whom she bore to Abraham, sporting with Isaac her son, and said to Abraham, Cast out this bond-woman and her son; for the son of this bond-woman shall not share the inheritance of my son Isaac. And the matter seemed very grievous in Abraham’s sight, because of his son. But God said to Abraham, Let it not be grievous in thy sight because of the son, and because of the bond-woman. …

The elements are worshipped, the air by Diogenes, the water by Thales, the fire by Hippasus; and by those who suppose atoms to be the first principles of things, arrogating the name of philosophers, being wretched creatures devoted to pleasure. “Wherefore I pray,” says the apostle, “that your love may abound yet more and more, in knowledge and in all judgment, that ye may approve things that are excellent.” “Since, when we were children,” says the same apostle, “we were kept in bondage under the rudiments of the world. And the child, though heir, differeth nothing from a servant, till the time appointed of the father.” Philosophers, then, are children, unless they have been made men by Christ. “For if the son of the bond woman shall not be heir with the son of the free,” at least he is the seed of Abraham, though not of promise, receiving what belongs to him by free gift. …

8. I hear that some of you are more cast down with sorrow by this event, than by the fall of the two deacons who had joined us from the Donatist party, as if they had brought reproach upon the discipline of Proculeianus; whereas this checks your boasting about me, that under my discipline no such inconsistency among the clergy had taken place. Let me frankly say to you, whoever you are that have done this, you have not done well. Behold, God hath taught you, “He that glorieth, let him glory in the Lord;” and ye ought to bring no reproach against heretics but this, that they are not Catholics. …

Of which thing I do not doubt what follows is to be understood, “And will divide Israel in twain,” to wit, into Israel pertaining to the bond woman, and Israel pertaining to the free. For these two kinds were at first together, as Abraham still clave to the bond woman, until the barren, made fruitful by the grace of God, cried, “Cast out the bond woman and her son.” We know, indeed, that on account of the sin of Solomon, in the reign of his son Rehoboam, Israel was divided in two, and continued so, the separate parts having their own kings, until that whole nation was overthrown with a great destruction, and carried away by the Chaldeans. …

25. So then, as we are not to deny that this is the gift of God, we are thus to understand that there be some gifts of God possessed by the sons of that Jerusalem which is above, and free, and mother of us all, (for these are in some sort the hereditary possessions in which we are “heirs of God and joint-heirs with Christ:”) but some other which may be received even by the sons of concubines to whom carnal Jews and schismatics or heretics are compared. …

14. Just as though their party gained the power of generation in virtue of what constitutes its division, and not from what causes its union with the Church. For it is severed from the bond of peace and charity, but it is joined in one baptism. And so there is one Church which alone is called Catholic; and whenever it has anything of its own in these communions of different bodies which are separate from itself, it is most certainly in virtue of this which is its own in each of them that it, not they, has the power of generation. For neither is it their separation that generates, but what they have retained of the essence of the Church; and if they were to go on to abandon this, they would lose the power of generation. …

8. The patriarchs, then, are these three, Abraham, Isaac, and Jacob. You know that the sons of Jacob were twelve, and thence the people Israel; for Jacob himself is Israel, and the people Israel in twelve tribes pertaining to the twelve sons of Israel. Abraham, Isaac, and Jacob three fathers, and one people. The fathers three, as it were in the beginning of the people; three fathers in whom the people was figured: and the former people itself the present people. For in the Jewish people was figured the Christian people. There a figure, here the truth; there a shadow, here the body: as the apostle says, “Now these things happened to them in a figure.” It is the apostle’s voice: “They were written,” saith he, “for our sakes, upon whom the end of the ages is come.” Let your mind now recur to Abraham, Isaac, and Jacob. …

12. A great mystery is there. They were playing together, Ishmael and Isaac: Sarah sees them playing, and says to Abraham, “Cast out the bond woman and her son; for the son of the bond woman shall not be heir with my son Isaac.” And when Abraham was sorrowful, the Lord confirmed to him the saying of his wife. Now here is evidently a mystery, that the event was somehow pregnant with something future. She sees them playing, and says, “Cast out the bond woman and her son.” What is this, brethren? For what evil had Ishmael done to the boy Isaac, in playing with him? That playing was a mocking; that playing signified deception. Now attend, beloved, to this great mystery. …

4. No man can return into his mother’s bowels and be born again. But some one is born of a bond woman? Well, did they who were born of bond women at the former time, return into the wombs of the free to be born anew? The seed of Abraham was in Ishmael also; but that Abraham might have a son of the bond maid, it was at the advice of his wife. The child was of the husband’s seed, not of the womb, but at the sole pleasure of the wife. Was his birth of a bond woman the reason why he was disinherited? Then, if he was disinherited because he was the son of a bond woman, no sons of bond women would be admitted to the inheritance. The sons of Jacob were admitted to the inheritance; but Ishmael was put out of it, not because born of a bond woman, but because he was proud to his mother, proud to his mother’s son; for his mother was Sarah rather than Hagar. …

Ver. 29, 30 . “But as then he that was born after the flesh persecuted him that was born after the Spirit, even so it is now. Howbeit what saith the Scripture? ( Gen. xxi. 10 .) Cast out the handmaid and her son: for the son of the handmaid shall not inherit with the son of the freewoman.” What! does all this consolation consist in showing that freemen are persecuted by bond-men? By no means, he says, I do not stop here, listen to what follows, and then, if you be not pusillanimous under persecution, you will be sufficiently comforted. And what is it that follows? “Cast out the son of the handmaid, for he shall not inherit with the son of the freewoman.” Behold the reward of tyranny for a season, and of reckleness out of season! the son is cast out of his father’s house, and becomes, together with his mother, an exile and a wanderer. …

Reply . Not every woman that is joined to a man is his wife, even as every son is not his father’s heir. But the marriage bond is legitimate between the freeborn and between equals: this was laid down by the Lord long before the Roman law had its beginning. And so a wife is different from a concubine, even as a bondwoman from a freewoman. For which reason also the Apostle in order to show the difference of these persons quotes from Genesis, where it is said to Abraham, “Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with my son Isaac.” And hence, since the marriage tie was from the beginning so constituted as apart from the joining of the sexes to symbolize the mystic union of Christ and His Church, it is undoubted that that woman has no part in matrimony, in whose case it is shown that the mystery of marriage has not taken place. …