
Who Saw the Transfiguration
Jesus did not take Peter, James, and John with him up to the mount of transfiguration because they were in any sense better prepared than the other apostles to witness what happened, or because they were spiritually more fit to enjoy such a rare privilege. Not at all. He well knew that none of the twelve were spiritually qualified for this experience; therefore did he take with him only the three apostles who were assigned to accompany him at those times when he desired to be alone to enjoy solitary communion. ~ The Urantia Book, 158:2.5

The Messengers' Testimony
Jesus welcomed this testimony regarding the success of his earth mission presented by the messengers of the Eternal Son and the Infinite Spirit, but he noted that his Father did not indicate that the Urantia bestowal was finished; only did the unseen presence of the Father bear witness through Jesus’ Personalized Adjuster, saying, “This is my beloved Son; give heed to him.” And this was spoken in words to be heard also by the three apostles. ~ The Urantia Book, 158:3.4

You Shall See Greater Things
The three apostles were so badly frightened that they were slow in collecting their wits, but Peter, who was first to recover himself, said, as the dazzling vision faded from before them and they observed Jesus standing alone: "Jesus, Master, it is good to have been here. We rejoice to see this glory. We are loath to go back down to the inglorious world. If you are willing, let us abide here, and we will erect three tents, one for you, one for Moses, and one for Elijah." And Peter said this because of his confusion, and because nothing else came into his mind at just that moment.
While Peter was yet speaking, a silvery cloud drew near and overshadowed the four of them. The apostles now became greatly frightened, and as they fell down on their faces to worship, they heard a voice, the same that had spoken on the occasion of Jesus' baptism, say: "This is my beloved Son; give heed to him." And when the cloud vanished, again was Jesus alone with the three, and he reached down and touched them, saying: "Arise and be not afraid; you shall see greater things than this." But the apostles were truly afraid; they were a silent and thoughtful trio as they made ready to descend the mountain shortly before midnight. ~ The Urantia Book, 158:1.9

A Celestial Pageant
That which Peter, James, and John witnessed on the mount of transfiguration was a fleeting glimpse of a celestial pageant which transpired that eventful day on Mount Hermon. The transfiguration was the occasion of:
1. The acceptance of the fullness of the bestowal of the incarnated life of Michael on Urantia by the Eternal Mother-Son of Paradise. As far as concerned the requirements of the Eternal Son, Jesus had now received assurance of their fulfillment. And Gabriel brought Jesus that assurance.
2. The testimony of the satisfaction of the Infinite Spirit as to the fullness of the Urantia bestowal in the likeness of mortal flesh. The universe representative of the Infinite Spirit, the immediate associate of Michael on Salvington and his ever-present coworker, on this occasion spoke through the Father Melchizedek.
Jesus welcomed this testimony regarding the success of his earth mission presented by the messengers of the Eternal Son and the Infinite Spirit, but he noted that his Father did not indicate that the Urantia bestowal was finished; only did the unseen presence of the Father bear witness through Jesus’ Personalized Adjuster, saying, “This is my beloved Son; give heed to him.” And this was spoken in words to be heard also by the three apostles. ~ The Urantia Book, 158:3.1

Habiliments of Light
When the three had been fast asleep for about half an hour, they were suddenly awakened by a near-by crackling sound, and much to their amazement and consternation, on looking about them, they beheld Jesus in intimate converse with two brilliant beings clothed in the habiliments of the light of the celestial world.
~ The Urantia Book, (158:2.8)