The following is taken from St. Louis de Montfort's True Devotion to Mary.
20. As all perfection consists in our being conformed, united and consecrated to Jesus it naturally follows that the most perfect of all devotions is that which conforms, unites, and consecrates us most completely to Jesus. Now of all God's creatures Mary is the most conformed to Jesus. It therefore follows that, of all devotions, devotion to her makes for the most effective consecration and conformity to him. The more one is consecrated to Mary, the more one is consecrated to Jesus. That is why perfect consecration to Jesus is but a perfect and complete consecration of oneself to the Blessed Virgin, which is the devotion I teach; or in other words, it is the perfect renewal of the vows and promises of holy baptism.
121. This devotion consists in giving oneself entirely to Mary in order to belong entirely to Jesus through her. It requires us to give:
(1) Our body with its senses and members;
(2) Our soul with its faculties;
(3) Our present material possessions and all we shall acquire in the future;
(4) Our interior and spiritual possessions, that is, our merits, virtues and good actions of the past, the present and the future.
In other words, we give her all that we possess both in our natural life and in our spiritual life as well as everything we shall acquire in the future in the order of nature, of grace, and of glory in heaven. This we do without any reservation, not even of a penny, a hair, or the smallest good deed. And we give for all eternity without claiming or expecting, in return for our offering and our service, any other reward than the honour of belonging to our Lord through Mary and in Mary, even though our Mother were not - as in fact she always is - the most generous and appreciative of all God's creatures.
122. Note here that two things must be considered regarding our good works, namely, satisfaction and merit or, in other words, their satisfactory or prayer value and their meritorious value. The satisfactory or prayer value of a good work is the good action in so far as it makes condign atonement for the punishment due to sin or obtains some new grace. The meritorious value or merit is the good action in so far as it merits grace and eternal glory. Now by this consecration of ourselves to the Blessed Virgin we give her all satisfactory and prayer value as well as the meritorious value of our good works, in other words, all the satisfactions and the merits. We give her our merits, graces and virtues, not that she might give them to others, for they are, strictly speaking, not transferable, because Jesus alone, in making himself our surety with his Father, had the power to impart his merits to us. But we give them to her that she may keep, increase and embellish them for us, as we shall explain later, and we give her our acts of atonement that she may apply them where she pleases for God's greater glory.
123. It follows then:
(1) that by this devotion we give to Jesus all we can possibly give him, and in the most perfect manner, that is, through Mary's hands. Indeed we give him far more than we do by other devotions which require us to give only part of our time, some of our good works or acts of atonement and penances. In this devotion everything is given and consecrated, even the right to dispose freely of one's spiritual goods and the satisfactions earned by daily good works. This is not done even in religious orders. Members of religious orders give God their earthly goods by the vow of poverty, the goods of the body by the vow of chastity, their free will by the vow of obedience, and sometimes their freedom of movement by the vow of enclosure. But they do not give him by these vows the liberty and right to dispose of the value of their good works. They do not despoil themselves of what a Christian considers most precious and most dear - his merits and satisfactions.
124. (2) It follows then that anyone who in this way consecrates and sacrifices himself voluntarily to Jesus through Mary may no longer dispose of the value of any of his good actions. All his sufferings, all his thoughts, words, and deeds belong to Mary. She can then dispose of them in accordance with the will of her Son and for his greater glory. This dependence, however, is without detriment to the duties of a person's present and future state of life. One such duty, for example, would be that of a priest who, by virtue of his office or otherwise, must apply the satisfactory or prayer value of the Holy Mass to a particular person. For this consecration can only be made in accordance with the order established by God and in keeping with the duties of one's state of life.
125. (3) It follows that we consecrate ourselves at one and the same time to Mary and to Jesus. We give ourselves to Mary because Jesus chose her as the perfect means to unite himself to us and unite us to him. We give ourselves to Jesus because he is our last end. Since he is our Redeemer and our God we are indebted to him for all that we are.