Fatherly Wisdom-Christ's Birth, Our Birth

From Leo the Great, Bishop of Rome [461]:

"The state of infancy which the Son of God did not find unworthy of his majesty gave way to the state of manhood with the passing of time and, once the triumph of his passion and resurrection had been accomplished, all the actions of humility undertaken for us came to an end. Nevertheless, in adoring the birth of our Savior, we find that we are celebrating the commencement of our own life. For the birth of Christ is the source of life for the Christian people, and the birthday of the Head is the birthday of the body" (Sermon 6 for Christmas; cited from Wright, Readings for the Daily Office from the Early Church, p. 20).