O God, Who didst will that thy Word should, by the message of an Angel,
take flesh in the womb of the Blessed Virgin Mary, grant unto us,
we beseech thee, that all who do believe her to be in very deed
the Mother of God, may be helped by her prayers in thy sight.
- Vespers I, Annunciation of the Blessed Virgin Mary
St. Louis Marie de Montfort: True Devotion - On the Incarnation
"God the Father gave his only Son to the world only through Mary. Whatever desires the patriarchs may have cherished, whatever entreaties the prophets and saints of the Old Law may have had for 4,000 years to obtain that treasure, it was Mary alone who merited it and found grace before God by the power of her prayers and the perfection of her virtues. "The world being unworthy," said Saint Augustine, "to receive the Son of God directly from the hands of the Father, he gave his Son to Mary for the world to receive him from her."
The Son of God became man for our salvation but only in Mary and through Mary. God the Holy Spirit formed Jesus Christ in Mary but only after having asked her consent through one of the chief ministers of his court.
God the Father imparted to Mary his fruitfulness as far as a mere creature was capable of receiving it, to enable her to bring forth his Son and all the members of his mystical body. God the Son came into her virginal womb as a new Adam into his earthly paradise, to take his delight there and produce hidden wonders of grace.
The Holy Spirit could not leave such wonderful and inconceivable dependence of God unmentioned in the Gospel, though he concealed almost all the wonderful things that Wisdom Incarnate did during his hidden life in order to bring home to us its infinite value and glory. Jesus gave more glory to God his Father by submitting to his Mother for thirty years than he would have given him had he converted the whole world by working the greatest miracles. How highly then do we glorify God when to please him we submit ourselves to Mary, taking Jesus as our sole model."