Genesis 18:14

Then I replied, “You are aware, then, that the Scripture says, ‘And the Lord said to Abraham, Why did Sarah laugh, saying, Shall I truly conceive? for I am old. Is anything impossible with God? At the time appointed shall I return to thee according to the time of life, and Sarah shall have a son.’ And after a little interval: ‘And the men rose up from thence, and looked towards Sodom and Gomorrah; and Abraham went with them, to bring them on the way. And the Lord said, I will not conceal from Abraham, my servant, what I do.’ And again, after a little, it thus says: ‘The Lord said, The cry of Sodom and Gomorrah is great, and their sins are very grievous. I will go down now, and see whether they have done altogether according to their cry which has come unto me; and if not, that I may know. And the men turned away thence, and went to Sodom. …

So it is either the Father or the Son, and the day is not the same as the night; nor is the Father the same as the Son, in such a way that Both of them should be One, and One or the Other should be Both, an opinion which the most conceited “Monarchians” maintain. He Himself, they say, made Himself a Son to Himself. Now a Father makes a Son, and a Son makes a Father; and they who thus become reciprocally related out of each other to each other cannot in any way by themselves simply become so related to themselves, that the Father can make Himself a Son to Himself, and the Son render Himself a Father to Himself. And the relations which God establishes, them does He also guard. A father must needs have a son, in order to be a father; so likewise a son, to be a son, must have a father. It is, however, one thing to have, and another thing to be. …

If thou also weep thus, thou art become a follower of thy Lord. Yea, for He also wept, both over Lazarus, and over the city; and touching Judas He was greatly troubled. And this indeed one may often see Him do, but nowhere laugh, nay, nor smile but a little; no one at least of the evangelists hath mentioned this. Therefore also with regard to Paul, that he wept, that he did so three years night and day,both he hath said of himself, and others say this of him; but that he laughed, neither hath he said himself anywhere, neither hath so much as one other of the saints, either concerning him, or any other like him; but this is said of Sarah only,when she is blamed, and of the son of Noe, when for a freeman he became a slave.

It is not merely that the Church was barren like Sarah, or became a mother of many children like her, but she bore them in the way Sarah did. As it was not nature but the promise of God which rendered Sarah a mother, [for the word of God which said, “At the time appointed I will return unto thee, and Sarah shall have a son,” ( Gen. xviii. 14 .) this entered into the womb and formed the babe,] so also in our regeneration it is not nature, but the Words of God spoken by the Priest, (the faithful know them,) which in the Bath of water as in a sort of womb, form and regenerate him who is baptized.

28. Lest you fall into the error of supposing that this acknowledgment of the One was a payment of honor to all the three whom Abraham saw in company, mark the words of Lot when he saw the two who had departed; And when Lot saw them, he rose up to meet them, and he bowed himself with his face toward the ground; and he said, Behold, my lords, turn in to your servant’s house . Here the plural lords shews that this was nothing more than a vision of angels; in the other case the faithful patriarch pays the honour due to One only. Thus the sacred narrative makes it clear that two of the three were mere angels; it had previously proclaimed the One as Lord and God by the words, And the Lord said unto Abraham, Wherefore did Sarah laugh, saying, Shall I then bear a child? But I am grown old. …

4. And Ezekiel said: This is the iniquity of Sodom and of her daughters, that they did not take by the hand the poor and needy; and when I saw these things in them, I overthrew them . And consider and see that, from the time that Sodom was overthrown until Jerusalem was built, there were eight hundred and ninety-six years. From the time that Abraham was informed by God through the Angel that at this time next year I will return to thee, and Sarah thy wife shall have a son , from that time till Jacob entered Egypt was a hundred and ninety-one years: and the children of Jacob were in Egypt two hundred and twenty-five years. …