Jesus Gave Mary to His Church
6. The mystery of Christ’s immense love for us is revealed with dazzling brilliance in the fact that the dying Saviour bequeathed His Mother to His disciple John in the memorable testament: “Behold thy son.” Now in John, as the Church has constantly taught, Christ designated the whole human race, and in the first rank are they who are joined with Him by faith. It is in this sense that St. Anselm of Canterbury says: “What dignity, O Virgin, could be more highly prized than to be the Mother of those to whom Christ deigned to be Father and Brother!”(2) With a generous heart Mary undertook and discharged the duties of her high but laborious office, the beginnings of which were consecrated in the Cenacle. With wonderful care she nurtured the first Christians by her holy example, her authoritative counsel, her sweet consolation, her fruitful prayers. She was, in very truth, the Mother of the Church, the Teacher and Queen of the Apostles, to whom, besides, she confided no small part of the divine mysteries which she kept in her heart.
7. It is impossible to measure the power and scope of her offices since the day she was taken up to that height of heavenly glory in the company of her Son, to which the dignity and luster of her merits entitle her. From her heavenly abode she began, by God’s decree, to watch over the Church, to assist and befriend us as our Mother; so that she who was so intimately associated with the mystery of human salvation is just as closely associated with the distribution of the graces which for all time will flow from the Redemption.
from the Encyclical Adiutricem by Pope Leo XIII