With three chosen disciples Jesus went up the mountain. Then he was transfigured by a wonderful light that made even his clothes seem to shine. Moses and Elijah stood by him and spoke with him of how he was going to complete his task on earth by dying in Jerusalem. In other words, they spoke of the mystery of his incarnation, and of his saving passion upon the cross. For the law of Moses and the teaching of the holy prophets clearly foreshadowed the mystery of Christ... The presence of Moses and Elijah, and their speaking together, was meant to show unmistakably that the law and the prophets were the attendants of our Lord Jesus Christ... They did not simply appear in silence; they spoke of how Jesus was to complete his task by dying in Jerusalem, they spoke of his passion and cross, and of the resurrection that would follow.
Thinking no doubt that the time for the kingdom of God had already come, Peter would gladly have remained on the mountain. He suggested putting up three tents, hardly knowing what he was saying. But it was not yet time for the end of the world; nor was it in this present time that the hopes of the saints would be fulfilled - those hopes founded on Paul's promise that Christ «would transform our lowly bodies into the likeness of his heavenly body» (Phil 3,21).
Only the initial stage of the divine plan had as yet been accomplished. Until its completion was it likely that Christ, who came on earth for love of the world, would give up his wish to die for it? For his submitting to death was the world's salvation, and his resurrection was death's destruction. (Saint Cyril of Alexandria (380-444), Bishop, Doctor of the Church, Homilies on the Transfiguration, 9)
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