The Transfiguration celebrates the moment when Jesus, on a high mountain with Peter, James, and John, was revealed in divine glory — his face shining like the sun, his clothes dazzling white — while Moses and Elijah appeared with him and the Father's voice declared: 'This is my beloved Son; listen to him.' The feast proclaims the mystery of Christ's two natures: the divine glory that his human flesh ordinarily veiled was momentarily made visible, confirming the disciples' faith before the approaching Passion.