Mark 9:1
This verse goes with what Jesus had just been saying previously about his betrayal and crucifixion. Why? It was a reassurance of his power and identity as the Messiah. These men were expecting the Messiah to set up a kingdom, not die on a cross. But, they had to learn that the cross and the crown went together.
Jesus words seem clearly to point to what to was about to take place on the mount of transfiguration. Jesus is the kingdom, for he is the king. And, he is revealed as such to the small group he takes with him to the mount.
Heavenly Father, thank you for King Jesus! I am so glad that he is not just my Savior, but that he is also my King. We are looking forward to that wonderful future in which Christ shall reign physically and spiritually over all of this universe. Thank you for his glorious power! You have made him the Head of all. In the name of the Lord Jesus Christ I pray and praise you, Amen.