Before a Mystery as great as the Incarnation of the Son of God, which we celebrate during this Christmas season, it is proper to let a saint do the talking. Please read and meditate upon these beautiful words from St. Leo the Great on this great reality:
It was the devil’s boast that humanity had been deceived by his trickery and so had lost the gifts God had given it; and that it had been stripped of the endowment of immortality and so was subject to the harsh sentence of death. He also boasted that, sunk as he was in evil, he himself derived some consolation from having a partner in crime; and that God had been forced by the principle of justice to alter his verdict on humanity, which he had created in such an honourable state. All this called for the realisation of a secret plan whereby the unalterable God, whose will is indistinguishable from his goodness, might bring the original realisation of his kindness towards us to completion by means of a more hidden mystery, and whereby humanity, which had been led into a state of sin by the craftiness of the devil, might be prevented from perishing contrary to the purpose of God.
So without leaving his Father’s glory behind, the Son of God comes down from his heavenly throne and enters the depths of our world, born in an unprecedented order by an unprecedented kind of birth. In an unprecedented order, because one who is invisible at his own level was made visible at ours. The ungraspable willed to be grasped. Whilst remaining pre-existent, he begins to exist in time. The Lord of the universe veiled his measureless majesty and took on a servant’s form. The God who knew no suffering did not despise becoming a suffering man, and, deathless as he is, to be subject to the laws of death. By an unprecedented kind of birth, because it was inviolable virginity which supplied the material flesh without experiencing sexual desire. What was taken from the mother of the Lord was the nature without the guilt. And the fact that the birth was miraculous does not imply that in the lord Jesus Christ, born from the virgin’s womb, the nature is different from ours. The same one is true God and true man.