Isaias 66:7

And I said, “Listen, my friends, to the Scripture which induces me to act thus. Jesus commanded [us] to love even [our] enemies, as was predicted by Isaiah in many passages, in which also is contained the mystery of our own regeneration, as well, in fact, as the regeneration of all who expect that Christ will appear in Jerusalem, and by their works endeavour earnestly to please Him. These are the words spoken by Isaiah: ‘Hear the word of the Lord, ye that tremble at His word. Say, our brethren, to them that hate you and detest you, that the name of the Lord has been glorified. He has appeared to your joy, and they shall be ashamed. A voice of noise from the city, a voice from the temple, a voice of the Lord who rendereth recompense to the proud. Before she that travailed brought forth, and before the pains of labour came, she brought forth a male child. …

If any one, for there is no difficulty in speaking distinctly, should be vexed, and reply to what we have said: “But how, O virgins, can this explanation seem to you to be according to the mind of Scripture, when the Apocalypse plainly defines that the Church brings forth a male, while you teach that her labour-pains have their fulfilment in those who are washed in the laver?” We will answer, But, O faultfinder, not even to you will it be possible to show that Christ Himself is the one who is born. For long before the Apocalypse, the mystery of the Incarnation of the Word was fulfilled. And John speaks concerning things present and things to come. But Christ, long ago conceived, was not caught up to the throne of God when He was brought forth, from fear of the serpent injuring Him. …

III. Do thou, therefore, O lover of this festival, when thou hast considered well the glorious mysteries of Bethlehem, which were brought to pass for thy sake, gladly join thyself to the heavenly host, which is celebrating magnificently thy salvation. As once David did before the ark, so do thou, before this virginal throne, joyfully lead the dance. Hymn with gladsome song the Lord, who is always and everywhere present, and Him who from Teman, as says the prophet, hath thought fit to appear, and that in the flesh, to the race of men. Say, with Moses, “He is my God, and I will glorify Him; my father’s God, and I will exalt Him.” Then, after thine hymn of thanksgiving, we shall usefully inquire what cause aroused the King of Glory to appear in Bethlehem. His compassion for us compelled Him, who cannot be compelled, to be born in a human body at Bethlehem. …

6. Let me now fulfil the promise I made a little while ago and with all the skill of a rhetorician sing the praises of water and of baptism. In the beginning the earth was without form and void, there was no dazzling sun or pale moon, there were no glittering stars. There was nothing but matter inorganic and invisible, and even this was lost in abysmal depths and shrouded in a distorting gloom. The Spirit of God above moved, as a charioteer, over the face of the waters, and produced from them the infant world, a type of the Christian child that is drawn from the laver of baptism. A firmament is constructed between heaven and earth, and to this is allotted the name heaven, in the Hebrew Shamayim or ‘what comes out of the waters,’, and the waters which are above the heavens are parted from the others to the praise of God. …

For He who was of the Father, yet without mother, was born of woman without a father’s co-operation. And so far as He was born of woman, His birth was in accordance with the laws of parturition, while so far as He had no father, His birth was above the nature of generation: and in that it was at the usual time (for He was born on the completion of the ninth month when the tenth was just beginning), His birth was in accordance with the laws of parturition, while in that it was painless it was above the laws of generation. For, as pleasure did not precede it, pain did not follow it, according to the prophet who says, Before she travailed, she brought forth, and again, before her pain came she was delivered of a man-child . …