Light from Light

Every Sunday Catholics profess their believe in one Lord, Jesus Christ, the only Son of God who is “Light from Light”. What exactly does this last phrase mean? We can turn to a brief reflection given by Pope Benedict XVI on the moment in scripture where before a few witnesses going up a mountain to pray (Lk 9:28) “[Christ's] face shone like the sun, and his clothes become white as light” (Mt 17:2):

“The Transfiguration is a prayer event; it displays visibly what happens when Jesus talks with his Father: the profound interpenetration of his being with God, which then becomes pure light. In his oneness with the Father, Jesus is himself “light from light”.” -Pope Benedict XVI, Jesus of Nazareth