Church Fathers I. Mary is the Mother of God

"Many, my beloved, are the true testimonies concerning Christ. The Father bears witness from heaven of His Son: the Holy Ghost bears witness, descending bodily in likeness of a dove: the Archangel Gabriel bears witness, bringing good tidings to Mary: the Virgin Mother of God bears witness: the blessed place of the manger bears witness." Cyril of Jerusalem, Catechetical Lectures, X:19 (c. A.D. 350).