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Our Lady is Spiritual Vessel because she was created by God for the purpose of bringing Christ into the world. She did this by being immaculately conceived, that is to say, without original sin and its effects, for being made "full of grace", and for giving her "Fiat!" to suffering for God the Father by fulfilling the prophecies of the Messiah. She knew of all of these, with all the suffering coming it from it. She is chosen as the "heel" that would crush the head of the serpent by her holy obedience. She placed all of herself to the service of the Holy Will of God.
Our Lady is Vessel of Honor because she is Spiritual Vessel given 100% to the Holy Will of God, and therefore, every person who learns of this ought to see her as worthy of the greatest honors. She was given the highest responsibility given to any creature of God (as Jesus was not created but begotten) in the role of Salvation history.
St. Alphonsus Liguori on Our Lady as Singular Vessel of Devotion:
""Vas insigne devotion is: Vessel of singular devotion. Devotion, as St. Thomas teaches, consists in the readiness of our will to conform to the will of God. This readiness was the principal virtue that rendered his most holy mother so dear to God. And this we are given to understand by the answer of our Lord to the woman who called blessed the womb that bore him: "Yea rather blessed are they that hear the word of God and keep it." By this, according to Bede, the Lord intended to say, that Mary was happy by the union of her will with that of God, than by being his mother. That flower which always turns towards the sun is a true type of Mary. The divine will alone was the only aim and satisfaction of the heart of Mary, as she herself sang : My spirit hath re joiced in God my Saviour." Oh, blessed art thou, my Lady, who wast always and entirely united to the divine will ! Obtain for me the grace to live for the remainder of my life always in uniformity with the will of God."\
Vas spirituale, ora pro nobis.
Vas honorabile, ora pro nobis.
Vas insigne devotionis, ora pro nobis.