Christ is Born! Glorify Him!
One thing I would like to emphasize on this Great and Holy Feast is a title that St. Ambrose shows is attributed to all three persons of the Trinity (from the fifth chapter of the second book of his treatise On the Holy Spirit:
But who can doubt that the Holy Spirit gives life to all things; since both He, as the Father and the Son, is the Creator of all things; and the Almighty Father is understood to have done nothing without the Holy Spirit; and since also in the beginning of the creation the Spirit moved upon the water.
Thus, our Creator becomes incarnate today, as we sing in the Stichera of Vespers for the Nativity:
Today the Virgin gives birth to the Creator of all. Eden offers a cave, and a star reveals Christ, the Sun, unto those in darkness. The Magi, enlightened by faith, worshipped with gifts; and shepherds beheld the wonder, while Angels sang praises, saying: Glory to God in the highest.
What, then, shall we offer to our Creator who today is willingly seen as a babe born in a cave?