Man himself, so much admired, is a great mystery.
(Sermo 126, 4)
To have a good idea of God is the truest beginning of piety.
(De libero arbitrio I, 2,5)
It is night while this life is lived. And when is this night illuminated? It is lighted when Christ descends to the night. He took the flesh of this generation and our night received the light.
(En. in ps. 138,14)