{But he that descended out of heaven} (ei m(8820)ho ek tou
ouranou katabas). The Incarnation of the Pre-existent Son of God
who was in heaven before he came down and so knows what he is
telling about "the heavenly things." There is no allusion to the
Ascension which came later. This high conception of Christ runs
all through the Gospel and is often in Christ's own words as
here. {Which is in heaven} (ho (936e) en t(9369) ouran(9369)). This phrase
is added by some manuscripts, not by Aleph B L W 33, and, if
genuine, would merely emphasize the timeless existence of God's
Son who is in heaven even while on earth. Probably a gloss. But
"the Son of man" is genuine. He is the one who has come down out
of heaven.