Can you provide some insight on the mystery of the Nativity of Our Lord?

St. Leo the Great teaches: “Lowliness is assured by majesty, weakness by power, mortality by eternity . . . The Word of God took the nature of a servant without stain of sin, enlarging our humanity without diminishing his divinity. He emptied himself; though invisible he made himself visible, though Creator and Lord of all things he chose to be one of us mortal men. Yet this was the condescension of compassion, not the loss of omnipotence.”
 
The lowliness of his human nature is assumed in the majesty of His Divine nature. Then, Jesus true God and true man is powerful as God and humble as man.
 
The Word was made flesh and dwelt among us to pay the debt of our sinful state. A nature that was incapable of suffering was joined to one that could suffer. He assumed a nature capable of suffering, and even more, destined to suffer for our salvation and reconciliation with God.
 
Contemplating the mystery of the Nativity of Our Lord, with the angels, we sing: “Glory to God in the Highest and peace to his people on earth!”