In Mary’s Yes to the birth of God’s Son from her womb by the power of the Holy Spirit, Mary places her body, her whole self, at God’s disposal to do with as he pleases. Her Yes puts her will in perfect conformity with the will of the Son. Her Yes makes possible the Incarnation of Jesus. If God is to have entry into our world and be borne there, Mary’s Yes, this conformity of our will with God’s will, must be repeated again and again. On the Cross, this conformity of wills finds its definitive expression... On the Cross, this readiness is put to the proof and precisely the darkness in which Mary stands engulfed reflects the fullness of the identity of her will with that of Jesus. Faith is a community formed by the Cross, and it is only on the Cross that it achieves its full perfection.
Joseph Cardinal Ratzinger, Dresdener Katholikentreffen, July 10, 1987, Deutsche Tagespost, September 19, 1987