Matt. I. 1.
The book of the generation of Jesus Christ, the Son of David, the Son of Abraham.
Behold a third discourse, and we have not yet made an end of the prefatory matter. It was not then for nought that I said, It is the nature of these thoughts to have a great depth.
Come, then, let us speak today what remains. What is it then that is now required? Why Joseph’s genealogy is traced, who had no part in the birth. And one cause we have mentioned already; but it is necessary to mention likewise the other, that which is more mystical and secret than the first. What then is this? He would not that it should be manifest to the Jews, at the time of the birth, that Christ was born of a virgin.
Nay, be not troubled at the strangeness of the saying. For it is no statement of mine, but of our fathers, wonderful and illustrious men. For if He disguised many things from the first, calling Himself Son of Man, and has not everywhere clearly unfolded to us even His equality with the Father; why do you wonder at His having for a time disguised this also, taking order as He was for a certain great and marvellous purpose? and would have condemned her for adultery. For if in regard to the other matters, for which they had frequent precedents likewise in the old dispensation, they were quite shameless in their obstinacy (for so, because He had cast out devils, they called Him possessed; and because He healed on the Sabbath day, they supposed Him to be an adversary of God; and yet oftentimes even before this had the Sabbath been broken), what would they not have said, if this had been told them? Especially as they had all time before this on their side, in that it never had produced any such thing. For if after so many miracles they still called Him son of Joseph, how before the miracles would they have believed that He was born of a virgin?
It is then for this reason that both Joseph has his genealogy traced, and the Virgin betrothed to him. For if even he, who was both a just and wondrous man, required many things, in order that he should receive that which had come to pass; an angel, and the vision in dreams, and the testimony from the prophets; how could the Jews, being both dull and depraved, and of so unfriendly spirit towards Him, have admitted this idea into their minds? For the strangeness and novelty thereof would be sure greatly to disturb them, and the fact that they had never so much as heard of such a thing having happened in the times of their forefathers. For as the man who was once persuaded that He is Son of God, would after that have no cause to doubt concerning this too; so he who was accounting Him to be a deceiver and an adversary of God, how could he but have been yet more offended by this, and have been led on unto the opposite notion? For this cause neither do the apostles at the first directly say this, but while of His resurrection they discourse much and often (forasmuch as of this there were examples in the times before, although not such as this); that He was born of a virgin they do not say always: nay, not even His mother herself ventured to utter this. See, for instance, what says the Virgin even to Himself: Behold, Your father and I have sought You. For if this suspicion had been entertained, neither would He any longer have been accounted to be a Son of David, and this opinion not being held, many other evils besides would have arisen. For this cause neither do the angels say these things to all, but to Mary only, and Joseph; but when showing to the shepherds the glad tidings of that which had come to pass, they no longer added this.
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But why is it, that having mentioned Abraham, and having said that he begot Isaac, and Isaac, Jacob; and not having made any mention of his brother; when he has come to Jacob, he remembers both Judah, and his brethren? Now there are some that say, it was because of the perverseness of Esau, and of the rest that came before. But I should not say this; for if it were so, how is it that he a little after mentions such women? It being out of contraries, in this place, that His glory is manifested; not by having great forefathers, but low and of little account. For to the lofty One it is a great glory to be able to abase Himself exceedingly. Wherefore then did He not mention them? Because Saracens, and Ishmaelites, and Arabians, and as many as are sprung from those ancestors, have nothing in common with the race of the Israelites. For this cause then he passes over those in silence, and hastens on to His forefathers, and those of the Jewish people. Wherefore he says, And Jacob begot Judas and his brethren. For at this point the race of the Jews begins to have its peculiar mark.
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And Judas begot Phares and Zara of Thamar. What are you doing, O man, putting us in remembrance of a history that contains an unlawful intercourse? But why is this said? Since, if we were recounting the race of a mere man, one might naturally have been silent touching these things; but if of God Incarnate, so far from being silent, one ought to make a glory of them, showing forth His tender care, and His power. Yea, it was for this cause He came, not to escape our disgraces, but to bear them away. Therefore as He is the more admired, in that He not only died, but was even crucified (though the thing be opprobrious, yet the more opprobrious the more does it show Him full of love to man), so likewise may we speak touching His birth; it is not only because He took flesh upon Him, and became man, that we justly stand amazed at Him, but because He vouchsafed to have also such kinsfolk, being in no respect ashamed of our evils. And this He was proclaiming from the very beginnings of His birth, that He is ashamed of none of those things that belong to us; while He teaches us also hereby, never to hide our face at our forefathers’ wickedness, but to seek after one thing alone, even virtue. For such a man, though he have an alien for his ancestor, though he have a mother who is a prostitute, or what you will, can take no hurt thereby. For if the whoremonger himself, being changed, is nothing disgraced by his former life, much more will the wickedness of his ancestry have no power to bring to shame him that is sprung of an harlot or an adulteress, if he be virtuous.