John the Apostle
John 3:12BSB·traditional attribution

If I have told you about earthly things and you do not believe, how will you believe if I tell you about heavenly things?

John Calvin Reformed @genevareformer

12. If I have told you earthly things. Christ concludes that it ought to be laid to the charge of Nicodemus and others, if they do not make progress in the doctrine of the Gospel; for he shows that the blame does not lie with him, that all are not properly instructed, since he comes down even to the earth, that he may raise us to heaven.

Matthew Henry Presbyterian @wholebiblehenry

We found, in the close of the foregoing chapter, that few were brought to Christ at Jerusalem; yet here was one, a considerable one. It is worth while to go a great way for the salvation though but of one soul. Observe, I. Who this Nicodemus was. Not many mighty and noble are called; yet some are, and here was one.

Commenting on John 3:1-21

John Gill Reformed Baptist @doctorgill

And no man hath ascended into heaven,.... Though Enoch and Elias had, yet not by their own power, nor in the sense our Lord designs; whose meaning is, that no man had, or could go up to heaven, to bring from thence the knowledge of divine and heavenly things; in which sense the phrase is used in Deu 30:12, and which may be illustrated by...