No one has ascended into heaven, but he who descended out of heaven, the Son of Man, who is in heaven.
First, None but Christ was able to reveal to us the will of God for our salvation. Nicodemus addressed Christ as a prophet; but he must know that he is greater than all the Old-Testament prophets, for none of them had ascended into heaven. They wrote by divine inspiration, and not of their own knowledge; see John 1:18. Moses ascended into the mount, but not into heaven. No man hath attained to the certain knowledge of God and heavenly things as Christ has; see Matthew 11:27. It is not for us to send to heaven for instructions; we must wait to receive what instructions Heaven will send to us; see Proverbs 30:4 Deuteronomy 30:12.