Born of the Virgin for our regeneration

Consider here not the condition of her that bare but the will of Him that was born…

For the Lord Jesus Christ came to do away with not to endure our pollutions: not to succumb to our faults but to heal them. He came that He might cure every weakness of our corruptness and all the sores of our defiled souls: for which reason it behooved Him to be born by a new order, who brought to men's bodies the new gift of unsullied purity.

For the uncorrupt nature of Him that was born had to guard the primal virginity of the Mother, and the infused power of the Divine Spirit had to preserve in spotlessness and holiness that sanctuary which He had chosen for Himself: that Spirit (I say) who had determined to raise the fallen, to restore the broken, and by overcoming the allurements of the flesh to bestow on us in abundant measure the power of chastity: in order that the virginity which in others cannot be retained in child-bearing, might be attained by them at their second birth.

Saint Leo the Great

Sermon 22, On the Feast of the Nativity II

New Advent