I Now Pronounce You God and Church

At once virgin and mother, Mary is the symbol and the most perfect realization of the Church: "the Church indeed. . . by receiving the word of God in faith becomes herself a mother. By preaching and Baptism she brings forth sons, who are conceived by the Holy Spirit and born of God, to a new and immortal life. She herself is a virgin, who keeps in its entirety and purity the faith she pledged to her spouse." (CCC 507)

Wow. That's some deep imagery and symbolism.

The Cathechism also points out that by being born of a virgin, there can be no doubt that Jesus is the Son of God. While God could have brought Jesus into this world through the ordinary means of procreation (namely, an earthly mother AND father), the method he chose provides us with a new Adam. While the old Adam was born of the earth, the new Adam is born of Heaven.

We can further see in Jesus' virgin birth how we too can be "born" into God's family through the Sacrament of Baptism whereby we are given new life "not of blood nor of the will of the flesh nor of the will of man, but of God" (CCC 505). As the Catechism goes on to say:

The acceptance of this [new] life [in Christ] is virginal because it is entirely the Spirit's gift to man. The spousal character of the human vocation in relation to God is fulfilled perfectly in Mary's virginal motherhood.

Again I say, "Wow."