110 Venerable Brethren, may the Virgin Mother of God hear the prayers of Our paternal heart - which are yours also - and obtain for all a true love of the Church - she whose sinless soul was filled with the divine spirit of Jesus Christ above all other created souls, who "in the name of the whole human race" gave her consent "for a spiritual marriage between the Son of God and human nature." Within her virginal womb Christ our Lord already bore the exalted title of Head of the Church; in a marvelous birth she brought Him forth as the source of all supernatural life, and presented Him newly born, as Prophet, King and Priest to those who, from among Jews and Gentiles, were the first to come to adore Him. Furthermore, her only Son, condescending to His mother's prayer in "Cana of Galilee," performed the miracle by which "his disciples believed in Him." It was she, the second Eve, who, free from all sin, original or personal, and always more intimately united with her Son, offered Him on Golgotha to the Eternal Father for all the children of Adam, sin-stained by his unhappy fall, and her mother's rights and her mother's love were included in the holocaust. Thus she who, according to the flesh, was the mother of our Head, through the added title of pain and glory became, according to the Spirit, the mother of all His members. She it was through her powerful prayers obtained that the spirit of our Divine Redeemer, already given on the Cross, should be bestowed, accompanied by miraculous gifts, on the newly founded Church at Pentecost; and finally, bearing with courage and confidence the tremendous burden of her sorrows and desolation, she, truly the Queen of Martyrs, more than all the faithful "filled up those things that are wanting of the sufferings of Christ...for His Body, which is the Church"; and she continues to have for the Mystical Body of Christ, born of the pierced Heart of the Savior, the same motherly care and ardent love with which she cherished and fed the Infant Jesus in the crib.
Source: Mystici Corporis Christi (Vatican.va)