John 3:12 in the King James Version
If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things?
Context
11 Most certainly I tell you, we speak that which we know and testify of that which we have seen, and you don’t receive our witness.
12 If I told you earthly things and you don’t believe, how will you believe if I tell you heavenly things?
13 No one has ascended into heaven but he who descended out of heaven, the Son of Man, who is in heaven.