Jesus answered him, "Are you the teacher of Israel, and don't understand these things?
This is pretty much what Jesus said to Nicodemus. "No man has descended into heaven but he which came down from heaven, even the Son of man which was in heaven. And I've told you earthly things and you believe not. How would you believe if I've told you of heavenly things?" So, he speaks of Jesus coming down from heaven, but no man receiving His testimony.