Moses climbed a mountain, talked with God, came down and told the people that a prophet like him was coming, “Listen to him.”
Elijah climbed a mountain, talked with God, and came down.
Jesus, James, John, and Peter climbed a mountain, where Moses and Elijah met with Jesus and talked with him. Then a voice, “This is my beloved Son, Listen to him.”
When Moses was going down the mountain he overheard this word about Jesus, “Listen to him.”, and that is what he told the people when he came down the mountain.
This was the real Moses, the real Elijah, on the mountain with Jesus, Peter, James, and John. On this mountain, they had entered into an awareness of God’s knowing - God knows the Son, knows Moses, knows Elijah, knows Peter, James and John, not temporally, but in an eternal knowing, and for an eternal moment, all the men together there on the mountain got to know each other as real, as God knows them, even now knows them.
Jesus said, “before Abraham was born, I AM”.
We have this same knowing every time we participate the Mass - there is only one last supper, only one knowing of Jesus giving his body and blood to eat and to drink, and we only eat and drink once, even though we re-know it countless times. When you eat and drink it is the first, last, only operation that you are knowing.