Miscellanies 3.2.8

God, then, having made all things in common for man, and having brought the female together with the male in common and joined all living things alike, declared justice to be fellowship with equality. But those who were born in this way denied the fellowship that brought about their birth, and say, ‘Let the one who has married one woman keep her,’ though all could share, as the rest of the living things show.” Having said this word for word, he adds again in the very same words: “For he implanted in males a vigorous and more violent desire for the continuance of the races, which neither law nor custom nor anything else can abolish. For it is God's decree.” And how could this man still be considered in our discussion, when he plainly destroys both the law and the gospel by these words? For the one says, “You shall not commit adultery”; the other says, “Everyone who looks with desire has already committed adultery.” For “You shall not covet,” said by the law, shows the one God proclaimed through the law, the prophets, and the gospel; for it says, “You shall not covet your neighbor's wife.” And the neighbor is not the Jew to the Jew, for he is a brother and of the same spirit; it remains, then, that “neighbor” means the foreigner. For how is one who is able to share in the Spirit not a neighbor? For Abraham is the father not only of Hebrews but also of Gentiles.