Catechism of the Catholic Church
2617 Mary's prayer is revealed to us at the dawning of the fullness of time. Before the incarnation of the Son of God, and before the outpouring of the Holy Spirit, her prayer cooperates in a unique way with the Father's plan of loving kindness: at the Annunciation, for Christ's conception; at Pentecost, for the formation of the Church, his Body. 88 In the faith of his humble handmaid, the Gift of God found the acceptance he had awaited from the beginning of time. She whom the Almighty made "full of grace" responds by offering her whole being: "Behold I am the handmaid of the Lord; let it be [done] to me according to your word." "Fiat": this is Christian prayer: to be wholly God's, because he is wholly ours.
2618 The Gospel reveals to us how Mary prays and intercedes in faith. At Cana, 89 the mother of Jesus asks her son for the needs of a wedding feast; this is the sign of another feast - that of the wedding of the Lamb where he gives his body and blood at the request of the Church, his Bride. It is at the hour of the New Covenant, at the foot of the cross, 90 that Mary is heard as the Woman, the new Eve, the true "Mother of all the living."
2619 That is why the Canticle of Mary, 91 the Magnificat (Latin) or Megalynei (Byzantine) is the song both of the Mother of God and of the Church; the song of the Daughter of Zion and of the new People of God; the song of thanksgiving for the fullness of graces poured out in the economy of salvation and the song of the "poor" whose hope is met by the fulfillment of the promises made to our ancestors, "to Abraham and to his posterity for ever."
2620 Jesus' filial prayer is the perfect model of prayer in the New Testament. Often done in solitude and in secret, the prayer of Jesus involves a loving adherence to the will of the Father even to the Cross and an absolute confidence in being heard.
2621 In his teaching, Jesus teaches his disciples to pray with a purified heart, with lively and persevering faith, with filial boldness. He calls them to vigilance and invites them to present their petitions to God in his name. Jesus Christ himself answers prayers addressed to him.
2622 The prayers of the Virgin Mary, in her Fiat and Magnificat, are characterized by the generous offering of her whole being in faith.
English Translation of the Cathechism of the Catholic Church for the United States of America © 1997, United States Catholic Conference, Inc.