From the Catechism of the Catholic Church
148 The Virgin Mary most perfectly embodies the obedience of faith. By faith Mary welcomes the tidings and promise brought by the angel Gabriel, believing that “with God nothing will be impossible” and so giving her assent: “Behold I am the handmaid of the Lord; let it be [done] to me according to your word.” Elizabeth greeted her: “Blessed is she who believed that there would be a fulfillment of what was spoken to her from the Lord.” It is for this faith that all generations have called Mary blessed.
490 To become the mother of the Savior, Mary “was enriched by God with gifts appropriate to such a role.” The angel Gabriel at the moment of the annunciation salutes her as “full of grace”. In fact, in order for Mary to be able to give the free assent of her faith to the announcement of her vocation, it was necessary that she be wholly borne by God’s grace.
506 Mary is a virgin because her virginity is the sign of her faith “unadulterated by any doubt”, and of her undivided gift of herself to God’s will. It is her faith that enables her to become the mother of the Savior: “Mary is more blessed because she embraces faith in Christ than because she conceives the flesh of Christ.”
510 Mary “remained a virgin in conceiving her Son, a virgin in giving birth to him, a virgin in carrying him, a virgin in nursing him at her breast, always a virgin” (St. Augustine, Serm. 186, 1: PL 38, 999): with her whole being she is “the handmaid of the Lord” (Lk 1:38).
963 Since the Virgin Mary’s role in the mystery of Christ and the Spirit has been treated, it is fitting now to consider her place in the mystery of the Church. “The Virgin Mary . . . is acknowledged and honored as being truly the Mother of God and of the redeemer. . . . She is ‘clearly the mother of the members of Christ’ . . . since she has by her charity joined in bringing about the birth of believers in the Church, who are members of its head.” “Mary, Mother of Christ, Mother of the Church.”
964 Mary’s role in the Church is inseparable from her union with Christ and flows directly from it. “This union of the mother with the Son in the work of salvation is made manifest from the time of Christ’s virginal conception up to his death”; it is made manifest above all at the hour of his Passion:
Thus the Blessed Virgin advanced in her pilgrimage of faith, and faithfully persevered in her union with her Son unto the cross. There she stood, in keeping with the divine plan, enduring with her only begotten Son the intensity of his suffering, joining herself with his sacrifice in her mother’s heart, and lovingly consenting to the immolation of this victim, born of her: to be given, by the same Christ Jesus dying on the cross, as a mother to his disciple, with these words: “Woman, behold your son.”
970 “Mary’s function as mother of men in no way obscures or diminishes this unique mediation of Christ, but rather shows its power. But the Blessed Virgin’s salutary influence on men . . . flows forth from the superabundance of the merits of Christ, rests on his mediation, depends entirely on it, and draws all its power from it.” “No creature could ever be counted along with the Incarnate Word and Redeemer; but just as the priesthood of Christ is shared in various ways both by his ministers and the faithful, and as the one goodness of God is radiated in different ways among his creatures, so also the unique mediation of the Redeemer does not exclude but rather gives rise to a manifold cooperation which is but a sharing in this one source.”
974 The Most Blessed Virgin Mary, when the course of her earthly life was completed, was taken up body and soul into the glory of heaven, where she already shares in the glory of her Son’s Resurrection, anticipating the resurrection of all members of his Body.
2618 The Gospel reveals to us how Mary prays and intercedes in faith. At Cana, 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, that Mary is heard as the Woman, the new Eve, the true “Mother of all the living.”
500 Against this doctrine the objection is sometimes raised that the Bible mentions brothers and sisters of Jesus. The Church has always understood these passages as not referring to other children of the Virgin Mary. In fact James and Joseph, “brothers of Jesus”, are the sons of another Mary, a disciple of Christ, whom St. Matthew significantly calls “the other Mary”. They are close relations of Jesus, according to an Old Testament expression.