The transfiguration was completed on the Mount of Ascension. If Jesus had gone to heaven directly from the Mount of Transfiguration, He would have gone alone. He would have been nothing more to us than a glorious Figure. But He turned His back on the glory, and came down from the mountain to identify Himself with fallen humanity. The ascension is the complete fulfillment of the transfiguration. Our Lord returned to His original glory, but not simply as the Son of God—He returned to His father as the Son of Man as well.
(My Utmost for His Highest, Oswald Chambers)