Catena Aurea on John 8:13–18: Augustine of Hippo

But if the Father is with Thee, how did He send Thee? O Lord, Thy mission is Thy incarnation. Christ was here according to the flesh without withdrawing from the Father, because the Father and the Son are every where. Blush, thou Sabellian; our Lord doth not say, I am the Father, and I the self-same person am the Son; but, I am not alone, because the Father is with Me. Make a distinction then of persons, and distinction of intelligences: acknowledge that the Father is the Father, the Son the Son: but beware of saying, that the Father is greater, the Son less. Theirs is one substance, one coeternity, perfect equality. Therefore, He says, My judgment is true, because I am the Son of God. But that thou mayest understand how that the Father is with Me, it is not for the Son ever to leave the Father. I have taken up the form of a servant; but I have not lost the form of God. He had spoken of judgment: now He speaks of witness: It is also written in your law, that the testimony of two men is true.