16 But he takes us to the Old Testament, and beginning with Adam goes on to Zacharias and Elizabeth. He next confronts us with Peter and the rest of the Apostles. We are therefore bound to traverse the same course of argument and show that chastity was always preferred to the condition of marriage. And as regards Adam and Eve we must maintain that before the fall they were virgins in Paradise: but after they sinned, and were cast out of Paradise, they were immediately married.
Then we have the passage, “For this cause shall a man leave his father and mother, and shall cleave to his wife, and the two shall become one flesh,” in explanation of which the Apostle straightway adds, “This mystery is great, but I speak in regard of Christ, and of the Church.” Christ in the flesh is a virgin, in the spirit he is once married. For he has one Church, concerning which the same Apostle says, “Husbands, love your wives, even as Christ also loved the Church.” If Christ loves the Church holily, chastely, and without spot, let husbands also love their wives in chastity.
And let everyone know how to possess his vessel in sanctification and honour, not in the lust of concupiscence, as the Gentiles who know not God: “For God called us not for uncleanness, but in sanctification: seeing that you have put off the old man with his doings, and have put on the new man, which is being renewed unto knowledge after the image of him that created him: where there cannot be male and female, Greek and Jew, circumcision and uncircumcision, barbarian, Scythian, bondman, freeman: but Christ is all, and in all.”
The link of marriage is not found in the image of the Creator. When difference of sex is done away, and we are putting off the old man, and putting on the new, then we are being born again into Christ a virgin, who was both born of a virgin, and is born again through virginity. And whereas he says “Be fruitful, and multiply, and replenish the earth,” it was necessary first to plant the wood and to let it grow, so that there might be an after-growth for cutting down. And at the same time we must bear in mind the meaning of the phrase, “replenish the earth.”
Marriage replenishes the earth, virginity fills Paradise. This too we must observe, at least if we would faithfully follow the Hebrew, that while Scripture on the first, third, fourth, fifth, and sixth days relates that, having finished the works of each, “God saw that it was good,” on the second day it omitted this altogether, leaving us to understand that two is not a good number because it destroys unity, and prefigures the marriage compact. Hence it was that all the animals which Noah took into the ark by pairs were unclean.
Odd numbers denote cleanness. And yet by the double number is represented another mystery: that not even in beasts and unclean birds is second marriage approved. For unclean animals went in two and two, and clean ones by sevens, so that Noah after the flood might be able to immediately offer to God sacrifices from the latter.
Source: Against Jovinianus (New Advent)