A Sermon by Pope Saint Leo the Great on the Nativity of Christ. This sermon is read from Volume 12 of Nicene and Post Nicene Fathers, Second Series. This work is in the public domain. It has been edited for comprehension. Bibliographic information is available on this Holy Communion podcast post at www.cooperatorsoftruth.com or in the podcast feed.
This Sermon is the Third of Eight Sermons on the Nativity written by Pope Saint Leo the Great.
On the Feast of the Nativity, III.
I. The truths of the Incarnation never suffer from being repeated.
The things which are connected with the mystery of the solemn feast (of the Nativity) are well known to you, dearly-beloved, and have frequently been heard. But as distant visible light affords pleasure to eyes that are unimpaired, so, to sound hearts does the Saviour’s nativity give eternal joy. We must not keep silent about it, though we cannot treat of it as we ought. For we believe that when Isaiah asks, “who imagined his purpose?”, this question not only applies to that mystery, whereby the Son of God is co-eternal with the Father, but also to this birth whereby “the Word became flesh.”
And so God, the Son of God, equal and of the same nature from the Father and with the Father, Creator and Lord of the Universe, Who is completely present everywhere, and completely exceeds all things, in the due course, chose for Himself the day on which to be born of the blessed virgin Mary for the salvation of the world. He did this without loss of the mother’s honour. For her virginity was violated neither at the conception nor at the birth: “that it might be fulfilled,” as the Evangelist says, “what had been spoken by the Lord through Isaiah the prophet, saying, “behold the virgin shall conceive in the womb, and shall bear a son, and they shall call his name Emmanuel, which is interpreted, God with us.”
For this wondrous child-bearing of the holy Virgin produced in her offspring one person which was truly human and truly Divine, because neither substance so retained their properties that there could be any division of persons in them; nor was the creature taken into partnership with its Creator in such a way that the One was the in-dweller, and the other the dwelling; but rather so that the one nature was blended with the other. And although the nature which is taken is one, and that which takes is another, yet these two diverse natures come together into such close union that it is one and the same Son who says both that, as true Man, “He is less than the Father,” and that, as true God, “He is equal with the Father.”
II. The Arians could not comprehend the union of God and man.
This union, dearly beloved, whereby the Creator is joined to the creature, Arian blindness could not see with the eyes of intelligence. They did not believe that the Only-begotten of God was of the same glory and substance with the Father, and spoke of the Son’s Godhead as inferior. They used as an evidence the scripture that refers to his coming in the “form of a slave,” and also when he says “The Father is greater than I,”. But He also says, “I and my Father are one” For it is true that in “the form of a slave,”, that is in his humanity which He took at the end of the ages for our restoration, He is inferior to the Father. But in the form of God, in which He was before the ages, He is equal to the Father. I
In His human humiliation He was “made of a woman, made under the Law”, in His Divine majesty He is truly the Word of God, “through whom all things were made” Accordingly, He Who in the form of God made man, in the form of a slave was made man. For both natures retain their own proper character without loss: and as the form of God did not do away with the form of a slave, so the form of a slave did not impair the form of God. And so the mystery of power united to weakness,