Mary’s faith can also be compared to that of Abraham, whom St. Paul calls “our father in faith” (cf. Rom. 4:12). In the salvific economy of God’s revelation, Abraham’s faith constitutes the beginning of the Old Covenant; Mary’s faith at the Annunciation inaugurates the New Covenant. Just as Abraham “in hope believed against hope, that he should become the father of many nations” (cf. Rom. 4:18), so Mary, at the Annunciation, having professed her virginity (“How shall this be, since I have no husband?”) believed that through the power of the Most High, by the power of the Holy Spirit, she would become the Mother of God’s Son in accordance with the angel’s revelation: “The child to be born will be called holy, the Son of God” (Lk. 1:35) .
– Redemptoris Mater

The Marvelous Power Of The Cross | Pope Leo The Great
Our understanding, which is enlightened by the Spirit of truth, should receive with purity and freedom of heart the glory of the cross as it shines in heaven and on earth. It should see with inner vision the meaning of the Lord's words when he spoke of the imminence...