On the Incarnation, Book 4
Many Names, One Divine Person
For certainly, when the evangelist says that he by whom the world itself was made came into the world, and that he who as God is the creator of the world was made the Son of man, it makes no difference which particular title is used, since in every case God is meant. For his stooping down to us and his will do not take anything away from his divinity; rather they prove his divinity, because whatever he willed came to pass. So because he willed it, he came into the world; because he willed it, he was born a man; and because he willed it, he was called the Son of man. For just as there are so many words, so they are powers belonging to God. The variety of names in him takes nothing away from the effectiveness of his power. Whatever the names given him, in every case it is one and the same Person. Though there may be some variety in the outward form of his titles, there is only a single divine Person meant by all the names.