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There is no secret about how the Blessed Virgin is related to the Holy Eucharist. It is very simple: except for the Blessed Virgin, we would not have the Holy Eucharist.
The key to this relationship is the humanity of Jesus Christ. God as God, was present in the world from the dawn of creation. The same almighty power by which God brought the world into being is the same almighty power by which He sustains the world in existence and provides for its constant activity.
But something historic happened at the Annunciation. The moment Mary told the angel, "Be it done to me according to Your word," God began to be present in the world as man. The infant in Mary's womb was her God become Incarnate. It was the Word made Flesh. It was the Lord of the Universe become a human child.
It was from Mary that the Son of God took our human nature. It was from Mary that the Second Person of the Trinity received His humanity. It was through Mary that Jesus Christ, who is God from all eternity, became man, lived visibly on earth in Palestine and is now invisibly on earth in every church and chapel in the Catholic world where the Holy Eucharist is offered, received and reserved.
Mary's relationship to her Son has not changed since the Annunciation. As His Mother, she remains the Mother of Divine Grace, through whom He pours out His blessings on a sinful world. As Pope John Paul II observed in Redemptoris Mater, "Mary guides the faithful to the Eucharist."
by Fr. John A Hardon, S.J., From The Sponsor Magazine, March 1994