The MOST Theological Collection: Our Lady In Doctrine and Devotion
"XV. Mother of the Church"
Origen, On John 1. 6:" No one can understand the meaning of the Gospel [of St. John] if he has not rested on the breast of Jesus and received Mary from Jesus, to be his mother too."
Pius XII, To Marian Congress of Ottawa, Canada, June 19, 1947, English text from AAS 39. 271: "When the little maid of Nazareth uttered her fiat to the message of the angel... she became not only the Mother of God in the physical order of nature, but also in the supernatural order of grace she became the Mother of all, who... would be made one under the Headship of her divine Son."
John XXIII, Discorsi II, pp. 65-66: "She is the Mother of the Church, and contributes with her all powerful prayer and the graces that flow over her hands onto the world."
Paul VI, Closing Speech to Third Session of Vatican II, Nov. 21, 1964: "For the glory of the Virgin and our consolation, we proclaim Mary the Most Holy Mother of the Church, that is, the Mother of the whole People of God, both the faithful and the pastors."