The justification of this ... is to be found in the Annunciation itself. In that moment all mankind were joined with Mary, their representative. Her words included their words, and in a sense she included them. God viewed them through her. Now, the daily life of a Christian is nothing else than the formation of our Lord in that member of his Mystical Body. This formation does not take place without Mary. It is an outpouring and a part of the original Incarnation, so that Mary is really the Mother of the Christian just as she is of Christ. Her consent and her maternal care are just as necessary to the daily growth of Christ in the individual soul as they were to his original taking of flesh. What does all this involve for the Christian? It involves many important things of which this is one: he must deliberately and whole-heartedly acknowledge Mary's position as his representative in the sacrificial offering, begun at the Annunciation and completed on the cross, which earned Redemption. He must ratify the things she then did on his behalf, so that he can enjoy, without shame and in their fullness, the infinite benefits thereby brought to him. And that ratification: of what nature is it to be? Would a once-repeated act suffice? Work out the answer to this question in the light of the fact that it was through Mary that every act of one's life has become the act of a Christian. Is it not reasonable and proper that likewise every act should bear some impress of acknowledgment and gratitude to her? So the answer is the same as that already given: "You are to give her everything."

Handbook of the Legion of Mary

"The great master of Thomas Aquinas, Albert the Great, has a delightful phrase in a commentary on the Annunciation portion of the Gospel, which, rendered freely, says that Mary's Son gives infinitude to his Mother's excellence, there being also in the tree which produces the fruit some of that infinite perfection which belongs properly to the fruit.

In practice the Catholic Church looks upon the Mother of God as being an unbounded power in the realm of grace. She is considered as the Mother of the redeemed on account of the universality of her grace. In virtue of her divine motherhood, Mary is simply the vastest, the most efficient, the most universal supernatural power in Heaven and on earth, outside the Three Divine Persons." (Vonier: The Divine Motherhood)