Origen — on Phil 2:7 (ON FIRST PRINCIPLES 1.2.8)

“The Son, "emptying himself," of his equality with the Father and showing us a way of knowing him, was made an express image of his substance, so that we who were unable to see the glory of pure light that inhered in the greatness of his divinity might, through that which was made splendor for us, find a way of contemplating the divine light through the sight of that splendor.”