“And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.”
John 3:13 — Greek Interlinear
Church Fathers on John 3:13
After taking notice of this lack of knowledge in a person, who, on the strength of his magisterial station, set himself above others, and blaming the unbelief of such men, our Lord says, that if such as these do not believe, others will: No one has ascended into heaven, but He that came down from heaven, even the Son of man who is in heaven. This may be rendered: The spiritual birth shall be of such sort, as that men from being earthly shall become heavenly: which will not be…
Forasmuch as we are made one with Him, to the place from which He came alone in Himself, thither He returns alone in us; and He who is ever in heaven, daily ascends to heaven.
Nicodemus having said, We know that You are a teacher sent from God; our Lord says, And no man has ascended, &c. in that He might not appear to be a teacher only like one of the Prophets.