As he said this, a cloud came and overshadowed them; and they were afraid as they entered the cloud. And a voice came out of the cloud, saying, "This is my Son, my Chosen; listen to him!"

Luke 9:34-35

"At his Transfiguration Christ showed his disciples the splendor of his beauty, to which he will shape and color those who are his: 'He will reform our lowness configured to the body of his glory.'"

- St. Thomas Aquinas