Christ was transfigured while remaining human, but by opening to the disciples a small part of His divinity, He gave them the opportunity to touch another reality, incomprehensible to all those who are used to living by the rules of the earthly world. The light shown on the mountain of the Transfiguration was not given to the disciples in all its strength and power; they would not have endured that. Even what the disciples were given to see made such a strong and overwhelming impression on them that the disciples were very afraid. And yet they, human beings, were allowed to share in this light.
Peter's words about the three booths and about how good it is to be here are natural: they deeply reflect the inner state not only of Peter, but also of many of us when we first encounter staggering manifestations of the spiritual world. In such moments we risk forgetting everything and wanting only one thing: to remain where we feel good. But spiritual joys are not given so that we may passively enjoy them. Having given the disciples this strengthening, Christ goes back down with them into the world, where they, and we, still have much work to do.
