Jesus took his disciples Peter, James and John to the summit of Mount Tabor, where he was transfigured before them, and the Holy Prophets Moses and Elijah appeared to bear witness. "Then Peter answered and said to Jesus, 'Lord, it is good for us to be here; if you wish, let us make here three tabernacles: one for you, one for Moses, and one for Elijah.'"
What was Peter thinking? He had just witnessed the transcendent revelation of our Lord's divine nature blazing through His humanity--His face shining like the sun and His clothes as white as the light. And yet all that Peter could imagine was to construct earthly structures as though somehow to preserve this noumenal experience in time and space.
But then-- even while "he was still speaking, a bright cloud overshadowed them," and "suddenly a voice came out of the cloud, saying, 'This is my beloved Son in Whom I am well pleased. Hear Him.'" And in that very moment the disciples "fell on their faces and were greatly afraid."
For indeed, God's revelation to the human race can be neither contained nor circumscribed by any categories of human logic, nor can it be comprehended according to philosophical concepts. The light of Tabor is the uncreated light that has illumined the universe from the very beginning. It is by this light that we see light, and are enabled by grace to become sons and daughters of God.
The disciples were enabled by the grace of God to behold Christ as He truly is, always and everywhere throughout eternity, as we ourselves are destined to become--if we strive to purify our hearts and to persevere unto the end on the path of salvation.