According to St. Bonaventure, ...

According to St. Bonaventure, all the angels in heaven unceasingly call out to her: "Holy, holy, holy Mary, Virgin Mother of God." They greet her countless times each day with the angelic greeting, "Hail, Mary", while prostrating themselves before her, begging her as a favour to honour them with one of her requests. According to St. Augustine, even St. Michael, though prince of all the heavenly court, is the most eager of all the angels to honour her and lead others to honour her. At all times he awaits the privilege of going at her word to the aid of one of her servants.
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 Louis de Montfort

Quotes from the same author

As in the natural life a child must have a father and a mother, so in the supernatural life of grace a true child of the Church must have God for his Father and Mary for his mother. If he prides himself on having God for his Father but does not give to Mary the tender affection of a true child, he is an impostor and his father is the devil.
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 Louis de Montfort
Chosen soul, how will you bring this about? What steps will you take to reach the high level to which God is calling you? The means of holiness and salvation are known to everybody, since they are found in the Gospel; the masters of the spiritual life have explained them; the Saints have practiced them...These means are: sincere humility, unceasing prayer, complete self-denial, abandonment to Divine Providence, and obedience to the will of God.
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 Louis de Montfort
We never give more honour to Jesus than when we honour his Mother, and we honour her simply and solely to honour him all the more perfectly. We go to her only as a way leading to the goal we seek - Jesus, her Son.
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 Louis de Montfort
All true children of God have God for their father and Mary for his mother; anyone who does not have Mary for his mother, does not have God for his father.
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 Louis de Montfort
Let not that man presumes to look for mercy from God who offends His Holy Mother!
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 Louis de Montfort