To Florus 4.29

What help, then, can you gain from my unwillingness, amid discussion of the union of the sexes and the fertility of those who join together, to disparage it by the name of desire? Neither you nor Manichaeus has been able to prove that it is devilish. And the very sequence of the preceding argument had already made it clear that this sensation, which affects the bodies of those who unite, goes back to the work of the same one whose institution accounts for bodies, marriages, and seeds.