If devotion to the Blessed Virgin is necessary for all men simply to work out their salvation, it is even more necessary for those who are called to a special perfection. I do not believe that anyone can acquire intimate union with our Lord and perfect fidelity to the Holy Spirit without a very close union with the most Blessed Virgin and an absolute dependence on her support.
Louis de MontfortI have no better way of knowing if a man is for God than if he likes to say the Hail Mary and the Rosary.
Louis de MontfortThe pious and learned Jesuit, Suarez, Justus Lipsius, a devout and erudite theologian of Louvain, and many others have proved incontestably that devotion to our Blessed Lady is necessary to attain salvation.
Louis de MontfortWe must conclude that, being necessary to God by a necessity which is called "hypothetical", (that is, because God so willed it), the Blessed Virgin is all the more necessary for men to attain their final end. Consequently we must not place devotion to her on the same level as devotion to the other saints as if it were merely something optional.
Louis de Montfort