God is from everlasting to everlasting; therefore, he was not born and did not have a mother (Psalms 90:2). He is the eternal Spirit (Hebrews 9:14). Nevertheless, when He determined that He would take on human flesh, He birthed His humanity into the world by means of Mary. In this respect, we can say that Mary was the mother of God's humanity; or the mother of the Son of God; or the mother of God's own flesh. We say this recognizing that since it was God Himself who was manifested in the flesh, we can identify the Man Jesus as God (John 14:9). But when we speak of Mary and His birth, we would limit Mary's contribution to being the mother of God's Son, not God.