John 3:13

John 3:13. And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.

Now Nicodemus must have been indeed puzzled. Here was a man who had come down from heaven, yet who had gone up to heaven, and was still there, although he was at that moment talking to Nicodemus! Without the Spirit of God to explain the mystery, he could not make top or bottom of it.