And so all that the Son of God did and taught for the world’s reconciliation is not for us simply a matter of past history. Here and now we experience his power at work among us. Born of a virgin mother by the action of the Holy Spirit, Christ keeps his Church spotless and makes her fruitful by the inspiration of the same Spirit. In baptismal regeneration she brings forth children for God beyond all numbering. These are the sons of whom it is written: They are born not of blood, nor of the desire of the flesh, nor of the will of man, but of God.
–St. Leo the Great