I was trying to pray the fourth Luminous Mystery and realized I don’t really know much about the Transfiguration. So I googled and found an article that included this interesting bit:
In Luke 9:27, at the end of a speech to the twelve apostles, Jesus adds, enigmatically: “There are some standing here who will not taste death before they see the kingdom of God.” This has often been taken as a prophecy that the end of the world would occur before the first generation of Christians died out.
The phrase “kingdom of God” can also refer to other things, though, including the Church–the outward expression of God’s invisible kingdom. The kingdom is embodied in Christ himself and thus might be “seen” if Christ were to manifest it in an unusual way, even in his own earthly life.
Did such a manifestation occur? Yes, and it is the very next thing that Luke relates: the Transfiguration.
Pope Benedict states that it has been “convincingly argued that the placing of this saying immediately before the Transfiguration clearly relates it to this event. Some—that is to say, the three disciples who accompany Jesus up the mountain—are promised that they will personally witness the coming of the Kingdom of God ‘in power.’
“On the mountain the three of them see the glory of God’s Kingdom shining out of Jesus. On the mountain they are overshadowed by God’s holy cloud. On the mountain—in the conversation of the transfigured Jesus with the Law and the Prophets—they realize that the true Feast of Tabernacles has come. On the mountain they learn that Jesus himself is the living Torah, the complete Word of God. On the mountain they see the ‘power’ (dynamis) of the Kingdom that is coming in Christ.”
(Jesus of Nazareth, vol. 1, p. 317).
We thus may have the key to understanding Jesus’ mysterious statement just before the Transfiguration. He wasn’t talking about the end of the world. He was talking about this. In fact, Luke notes that the Transfiguration took place “about eight days after these sayings,” thus stressing its proximity to them and suggesting that it was the fulfillment of this saying, concerning the fact that some of them would see the kingdom of God.
Mark gives a different number of days, saying it was “after six days” (Mk. 9:2), but these both approximate a week.