Jerome
Catena Aurea · Matthäusevangelium 17
While he yet spake, behold, a bright cloud overshadowed them: and behold a voice out of the cloud, which said, This is my beloved Son, in whom I am well pleased; hear ye him. And when the disciples heard it, they fell on their face, and were sore afraid. And Jesus came and touched them, and said, Arise, and be not afraid. And when they had lifted up their eyes, they saw no man, save Jesus only. And as they came down from the mountain, Jesus charged them, saying, Tell the vision to no man, until the Son of man be risen again from the dead.
Their cause of terror is threefold. Because they knew that they had done amiss; or because the bright cloud had covered them; or because they had heard the voice of God the Father speaking; for human frailty cannot endure to look upon so great glory, and falls to the earth trembling through both soul and body. And by how much higher any one has aimed, by so much lower will be his fall, if he shall be ignorant of his own measure.