God made Mary the sole custodian of his treasures

Saint Louis de Montfort

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.

44. Mary alone found grace before God without the help of any other creature. All those who have since found grace before God have found it only through her. She was full of grace when she was greeted by the Archangel Gabriel and was filled with grace to overflowing by the Holy Spirit when he so mysteriously overshadowed her.

From day to day, from moment to moment, she increased so much this twofold plenitude that she attained an immense and inconceivable degree of grace. So much so, that the Almighty made her the sole custodian of his treasures and the sole dispenser of his graces. She can now ennoble, exalt and enrich all she chooses.

She can lead them along the narrow path to heaven and guide them through the narrow gate to life. She can give a royal throne, scepter and crown to whom she wishes. Jesus is always and everywhere the fruit and Son of Mary and Mary is everywhere the genuine tree that bears that Fruit of life, the true Mother who bears that Son.

45. To Mary alone God gave the keys of the cellars of divine love and the ability to enter the most sublime and secret ways of perfection, and lead others along them. Mary alone gives to  the unfortunate children of unfaithful Eve entry into that earthly paradise where they may walk pleasantly with God and be safely hidden from their enemies. There they can feed without fear of death on the delicious fruit of the tree of life and the tree of the knowledge of good and evil. They can drink copiously the heavenly waters of that beauteous fountain which gushes forth in such abundance. As she is herself the earthly paradise, that virgin and blessed land from which sinful Adam and Eve were expelled she lets only those whom she chooses enter her domain in order to make them saints.

46. All the rich among the people, to use an expression of the Holy Spirit as explained by St. Bernard, all the rich among the people will look pleadingly upon her countenance throughout all ages and particularly as the world draws to its end. This means that the greatest saints, those richest in grace and virtue will be the most assiduous in praying to the most Blessed Virgin, looking up to her as the perfect model to imitate and as a powerful helper to assist them.

47. I said that this will happen especially towards the end of the world, and indeed soon, because Almighty God and his holy Mother are to raise up great saints who will surpass in holiness most other saints as much as the cedars of Lebanon tower above little shrubs. This has been revealed to a holy soul whose life has been written by M. de Renty.

48. These great souls filled with grace and zeal will be chosen to oppose the enemies of God who are raging on all sides. They will be exceptionally devoted to the Blessed Virgin. Illumined by her light, strengthened by her food, guided by her spirit, supported by her arm, sheltered under her protection, they will fight with one hand and build with the other. With one hand they will give battle, overthrowing and crushing heretics and their heresies, schismatics and their schisms, idolaters and their idolatries, sinners and their wickedness.

With the other hand they will build the temple of the true Solomon and the mystical city of God, namely, the Blessed Virgin, who is called by the Fathers of the Church the Temple of Solomon  and the City of God . By word and example they will draw all men to a true devotion to her and though this will make many enemies, it will also bring about many victories and much glory to God alone. This is what God revealed to St. Vincent Ferrer, that outstanding apostle of his day, as he has amply shown in one of his works.

This seems to have been foretold by the Holy Spirit in Psalm 58: "The Lord will reign in Jacob and all the ends of the earth. They will be converted towards evening and they will be as hungry as dogs and they will go around the city to find something to eat." This city around which men will roam at the end of the world seeking conversion and the appeasement of the hunger they have for justice is the most Blessed Virgin, who is called by the Holy Spirit the City of God .