Chapter 5 — Part I: The Creed — Article III: Who Was Conceived by the Holy Ghost, Born of the Virgin Mary
Section 3. That such is the meaning of the above words is clear from the Creed of the Holy Council of Constantinople, which says: Who for us men, and for our salvation,, came down from heaven, and became incarnate by the Holy Ghost of the Virgin Mary, and was made man. The same truth we also find unfolded by St. John the Evangelist, who imbibed from the bosom of the Lord and Saviour Himself the knowledge of this most profound mystery. For when he had declared the nature of the Divine Word as follows: In the beginning was the Word, and the Word was with God, and the Word was God, he concluded: And the Word was made flesh and dwelt among us.