Solemnity of the Annunciation

As the great St. Irenaeus and so many of the holy fathers remark, the obedience of the second Eve repaired the disobedience of the first: for no sooner does the Virgin of Nazareth speak her fiat, 'be it done,' than the eternal Son of God (who, according to the divine decree, awaited this word) is present, by the operation of the Holy Ghost, in the chaste womb of Mary, and there He begins His human life...

Never was there a more entire or humiliating defeat than that which this day befell satan. The frail creature, over whom he had so easily triumphed at the beginning of the world, now rises and crushes his proud head. Eve conquers in Mary. God would not choose man for the instrument of His vengeance; the humiliation of satan would not have been great enough; and therefore she who was the first prey of hell, the first victim of the tempter, is selected to give battle to the enemy. The result of so glorious a triumph is that Mary is to be superior not only to the rebel angels, but to the whole human race, yea, to all the angels of heaven. Seated on her exalted throne, she, the Mother of God, is to be the Queen of all creation. Satan, in the depths of the abyss, will eternally bewail his having dared to direct his first attack against the woman, for God has now so gloriously avenged her; and in heaven, the very Cherubim and Seraphim reverently look up to Mary, and deem themselves honored when she smiles upon them, or employs them in the execution of any of her wishes, for she is the Mother of their God.
--Abbot Gueranger, O.S.B.