Isaias 1:21

8. Knowing, then, as I do, how to explain these things in detail, I deem it right at present to quote the words themselves. But since the expressions themselves urge us to speak of them. I shall not omit to do so. For these are truly divine and glorious things, and things well calculated to benefit the soul. The prophet, in using the expression, a lion’s whelp , means him who sprang from Judah and David according to the flesh, who was not made indeed of the seed of David, but was conceived by the (power of the) Holy Ghost, and came forth from the holy shoot of earth. For Isaiah says, “There shall come forth a rod out of the root of Jesse, and a flower shall grow up out of it.” That which is called by Isaiah a flower , Jacob calls a shoot. For first he shot forth, and then he flourished in the world. …

And He called them, indeed, “an evil generation,” because of the quality arising from evil which had been produced in them, for wickedness is voluntary evil-doing, but “adulterous” because that when the Pharisees and Sadducees left that which is figuratively called man, the word of truth or the law, they were debauched by falsehood and the law of sin. For if there are two laws, the law in our members warring against the law of the mind, and the law of the mind, we must say that the law of the mind, that is, the spiritual, is man, to whom the soul was given by God as wife, that is, to the man who is law, according to what is written, “A wife is married to a man by God;” but the other is a paramour of the soul which is subject to it, which also on account of it is called an adulteress. …

6. But if even real virgins, when they have other failings, are not saved by their physical virginity, what shall become of those who have prostituted the members of Christ, and have changed the temple of the Holy Ghost into a brothel? Straightway shall they hear the words: “Come down and sit in the dust, O virgin daughter of Babylon, sit on the ground; there is no throne, O daughter of the Chaldæans: for thou shalt no more be called tender and delicate. …

3. Who would not grieve over such things and say, “How is the faithful city become an harlot?” How would not the Lord Himself say to some of those who are now walking in the spirit of Jeremiah, “Hast thou seen what the virgin of Israel has done to me?” I betrothed her to me in trust, in purity, in righteousness, in judgment, in pity, and in mercy; as I promised her through Hosea the prophet. But she loved strangers, and while I, her husband, was yet alive, she is called adulteress, and is not afraid to belong to another husband. …