He that comes from above is above all: he that is of the earth is earthly, and speaks of the earth: he that comes from heaven is above all.
All Commentaries on John 3:31 Go To John 3
Augustine of Hippo
AD 430
Or, speaks of all the earth, he said of the man, i.e. of himself, so far as he speaks merely humanly. If he says ought divine, he is enlightened by God to say it: as said the Apostle; Yet not I, but the grace of God which was with me. John then, so far as pertains to John, is of the earth, and speaks of the earth: if you hear ought divine from him, attribute it to the Enlightener, not to him who has received the light.
But what is it, w which the Son has heard from the Father? Has He heard the word of the Father? Yes, but He is the Word of the Father. When you conceives a word, wherewith to name a thing, the very, conception of that thing in the mind is a word. Just then as you have in your mind and with you your spoken word; evenso God uttered the Word, i.e. begat the Son. Since then the Son is the Word of God, and the Son has spoken the Word of God to us, He has spoken to us the Father’s word. What John said is therefore true.