0 To Our Venerable Brethren, the Patriarchs, Primates, Archbishops, and other Ordinaries in Peace and Communion with the Apostolic See. As often as the occasion arises to stimulate and intensify the love and veneration of the Christian people for Mary, the great Mother of God, We are filled with wondrous satisfaction and joy, as by a subject which is not only of prime importance in itself and profitable in countless ways, but which also perfectly accords with the inmost sentiments of Our heart. For the holy reverence for Mary which We experienced from Our tenderest years, has grown greater and has taken firmer hold of Our soul with Our advancing age.
Source: Magnae Dei Matris (Vatican.va)