Circumcision of the Lord

From the Sermons of Pope St. Leo the Great.
7th for Christmas
Dearly beloved brethren, whosoever will keep truly and honour piously this day's festival, it is necessary for him neither to think falsely of the Lord's Incarnation, nor meanly of the Lord's Godhead. For as there is danger, on the one hand, of denying the truth of Christ's participation of our nature, so is there no less danger, on the other, of doing despite to the equality of His glory with the glory of the Father. Wherefore, when we draw near to understand the mystery of Christ's Birth, wherein He was born of the Virgin Mary, we must leave the clouds of earthly imagination behind and pierce the fog of human wisdom with the eye of enlightened faith.
V. But thou, O Lord, have mercy upon us.
R. Thanks be to God.