Six days later Jesus took with him Peter, James, and John, and led them up a high mountain, where they were alone. As they looked on, a change came over Jesus, and his clothes became shining white—whiter than anyone in the world could wash them. Then the three disciples saw Elijah and Moses talking with Jesus. Peter spoke up and said to Jesus, “Teacher, how good it is that we are here! We will make three tents, one for you, one for Moses, and one for Elijah.” He and the others were so frightened that he did not know what to say.
Then a cloud appeared and covered them with its shadow, and a voice came from the cloud, “This is my own dear Son—listen to him!” They took a quick look around but did not see anyone else; only Jesus was with them.
As they came down the mountain, Jesus ordered them, “Don’t tell anyone what you have seen, until the Son of Man has risen from death.”
They obeyed his order, but among themselves they started discussing the matter, “What does this ‘rising from death’ mean?”
Mark talks of the Transfiguration of Christ in terms of a metamorphosis. A change comes over Jesus and he takes on a form that his disciples haven’t seen before. Bishop Barron compares the change that came over Jesus here as a New Testament version of the burning bush. This is Jesus’ divinity shining forth.
In his divine form, Jesus frightened and bewildered his disciples. He had to revert to human form to be around them comfortably again. It is then that Jesus reveals to them for the first time that he is going to die and rise from the dead.
This mysterious and divine nature of his is the backbone and the hope of our faith.