God willed that Jesus Christ should have a true human mother but only God himself as his Father, because he wanted to make a new beginning that could be credited to him alone and not to earthly forces. [484-504, 508-510]
Mary’s virginity is not some outdated mythological notion but rather fundamental to the life of Jesus. He was born of a woman but had no human father. Jesus Christ is a new beginning in the world that has been instituted from on high. In the Gospel of Luke, Mary asks the angel, “How can this be, since I have no husband?” (= do not sleep with a man, Lk 1:34); the angel answered, “The Holy Spirit will come upon you” (lk 1:35). Although the Church from the earliest days was mocked on account of her belief in Mary’s virginity, she has always believed that her virginity is real and not merely symbolic.