John 3:11-13

¹¹Verily, verily, I say to thee, We speak what we know, and testify what we have seen; and ye receive not our testimony.

¹²If I have told you earthly things, and ye believe not, how will ye believe if I tell you heavenly things?

¹³And no man hath ascended to heaven, but he that came down from heaven, even the Son of man who is in heaven.