"The Fourth Mystery of Light"

  The Transfiguration

...Jesus took
with him Peter,
 James and his brother John
and led them up a high mountain, by
themselves. And he was transfigured before
them, and his face shone like the sun, and his clothes
became dazzling white. Suddenly there appeared to them
Moses and Elijah, talking with him. Then Peter said to Jesus,
"Lord, it is good that we are here; if you
 wish, I will make three dwellings here, one for you,
one for Moses, and one for Elijah." While he was still speaking,
suddenly a bright cloud over-shadowed them, and from the cloud
 a voice said, "This is my Son, the Beloved with whom I am well
pleased; listen to him!" When the disciples heard this, they fell to
the ground and were overcome by fear. But Jesus came and
 touched them saying, "Get up and do not be afraid." And when
they looked up, they saw no one except Jesus himself alone.
Matthew 17:1-8