One of his most famous writings, The Secret of Mary is a work on devotion to Mary by St. Louis de Montfort, based on his sermons from his travels throughout France.
“The means of salvation and holiness are known to all” (Page 9)
“Mary is the great mould of God, made by the Holy Ghost, in order to form a God-Man by the Hypostatic Union, and a Man-God by grace. In this mould, no feature of the Godhead is wanting; whoever is cast in it, and allows himself to be freely handled, receives therein all the features of Jesus Christ, who is True God.” (Page 14)
“The third devotion of the Holy Virgin, known and practised by very few, is that which I am about to unveil to you, predestinate souls. It consists in giving ourselves up entirely to the Most Holy Virgin, in the quality of slaves, in order to belong wholly to Jesus Christ; and in the next place to do all our actions with Mary, in Mary, by Mary, for Mary, in order to do them more perfectly with Jesus, in Jesus, by Jesus, and for Jesus, our Last End.” (Pages 20–21)
“The fifth practice is, to say with devotion the Ave Maria” (Page 42)
“Soul, living image of God, and redeemed by the precious Blood of Jesus Christ, the will of God concerning you, is that you should become holy like Him in this life, and glorious like Him in the next. The acquisition of the holiness of God is your sure vocation; and it is to this that all your thoughts, words, and actions, all your sufferings, and all the movements of your life must tend; or you will resist God by not doing that for which He has created you and is now preserving you.” (Pages 8–9)