Augustine of Hippo
Catena Aurea · Johannesevangelium 6
The Jews then murmured at him, because he said, I am the bread which came down from heaven. And they said, Is not this Jesus, the son of Joseph, whose father and mother we know? how is it then that he saith, I came down from heaven? Jesus therefore answered and said unto them, Murmur not among yourselves. No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day. It is written in the prophets, And they shall be all taught of God. Every man therefore that hath heard, and hath learned of the Father, cometh unto me. Not that any man hath seen the Father, save he which is of God, he hath seen the Father.
(super Joan. Tr. xxv. 7) All the men of that kingdom shall be taught of God; they shall hear nothing from men: for, though in this world what they hear with the outward ear is from men, yet what they understand is given them from within; from within is light and revelation. I force certain sounds into your ears, but unless He is within to reveal their meaning, how, O ye Jews, can ye acknowledge Me, ye whom the Father hath not taught?