Augustine of Hippo — as excerpted in the Catena Aurea on John 6:41-46

“(Tr. xxvi. 7. et seq.) Behold then how the Father draweth; not by laying a necessity on man, but by teaching the truth. To draw, belongeth to God: Every one that hath heard, and hath learned of the Father, cometh to Me. What then? Hath Christ taught nothing? Not so. What if men saw not the Father teaching, but saw the Son. So then the Father taught, the Son spoke. As I teach you by My word, so the Father teaches by His Word. But He Himself explains the matter, if we read on: Not that any man hath seen the Father, save He which is of God, He hath seen the Father; as if He said, Do not when I tell you, Every man that hath heard and learnt of the Father, say to yourselves, We have never seen the Father, and how then can we have learnt from Him? Hear Him then in Me. I know the Father, and am from Him, just as a word is from him who speaks it; i. e. not the mere passing sound, but that which remaineth with the speaker, and draweth the hearer.”