As our biological father gives life, our biological mother bears life. So God the Father gives life, His own life, so that we may live spiritually, Mary bears His life so that we may live spiritually. She is the mediatrix of all grace – grace is the life of God. As the source of grace, Jesus Christ came into the world through Mary, and so God chooses to continue to give the grace that He gives through her.
(Talk preached for an audience of Catholic men during a Silent Retreat)