Awake, mankind! For your sake God has become man. Awake, you who sleep, rise up from the dead, and Christ will enlighten you. I tell you again: for your sake, God became man.

Let us then joyfully celebrate the coming of our salvation and redemption. Let us celebrate the festive day on which he who is the great and eternal day came from the great and endless day of eternity into our own short day of time.

He has become our justice, our sanctification, our redemption, so that, as it is written: Let him who glories glory in the Lord.

Truth, then, has arisen from the earth: Christ who said, I am the Truth, was born of the Virgin. And justice looked down from heaven: because believing in this new-born child, man is justified not by himself but by God.

St. Augustine, Sermon on the Incarnation