And no man has ascended up to heaven, but he that came down from heaven, even the Son of man who is in heaven.
All Commentaries on John 3:13 Go To John 3
John Chrysostom
AD 407
Or thus: Nicodemus having said, We know that You are a teacher sent from God; our Lord says, And no man has ascended in that He might not appear to be a teacher only like one of the Prophets.
By the title Son of man here, He does not mean His flesh, but Himself altogether; the lesser part of His nature being put to express the whole. It is not uncommon with Him to name Himself wholly from His humanity, or wholly from His divinity.
That too which seems very lofty is still unworthy of His vastness. For He is not in heaven only, but every where, and fills all things. But for the present He accommodates Himself to the weakness of His hearer, that by degrees He may convert him.