Christ's birth from a virgin underlines that the Incarnation did not involve the coming into being of a new person. When a child is born from two human parents in the usual fashion, a new person begins to exist. But the person of the incarnate Christ is none other than the second person of the Holy Trinity. At Christ's birth, therefore, no new person came into existence, but the pre-existent person of the Son of God now began to live according to a human as well as a divine mode of being. So the Virgin Birth reflects Christ's eternal pre-existence.
