No one has ever gone into heaven except the one who came from heaven—the Son of Man.
What is there to do except to accept this statement at face value? Jesus spoke as one who had authority and this was why. He had the authority of God because he is God.
When we encounter the Jesus of the gospels we think of him as a man; he calls himself the son of man. But we must never forget that he is also God. There is no disputing with him. We cannot treat him as an equal. Although he subjected himself to the same traumas of life that we suffer, although he died on the cross, although he was betrayed and spat upon and hurt in so many ways; he was still God. We would do well to humble ourselves before him.