Catena Aurea on John 1:32–34: Augustine of Hippo

But who sent John? If we say the Father, we say true; if we say the Son, we say true. But it would be truer to say, the Father and the Son. How then knew he not Him, by Whom he was sent? For if he knew not Him, by Whom he wished to be baptized, it was rash in him to say, I have need to be baptized by Thee. So then he knew Him; and why saith he, I knew Him not?