Feast of the Immaculate Conception

I will put enmities between thee and the woman, and thy seed and her seed: she shall crush thy head, and thou shalt lie in wait for her heel.
Gen. 3, 15

 And the angel being come in, said unto her: Hail, full of grace, the Lord is with thee: blessed art thou among women. Who having heard, was troubled at his saying, and thought with herself what manner of salutation this should be. And the angel said to her: Fear not, Mary, for thou hast found grace with God. Behold thou shalt conceive in thy womb, and shalt bring forth a son; and thou shalt call his name Jesus. He shall be great, and shall be called the Son of the most High; and the Lord God shall give unto him the throne of David his father; and he shall reign in the house of Jacob for ever. And of his kingdom there shall be no end.
Luke 1:28-33

And Mary said to the angel: How shall this be done, because I know not man?  And the angel answering, said to her: The Holy Ghost shall come upon thee, and the power of the most High shall overshadow thee. And therefore also the Holy which shall be born of thee shall be called the Son of God. And behold thy cousin Elizabeth, she also hath conceived a son in her old age; and this is the sixth month with her that is called barren: Because no word shall be impossible with God. And Mary said: Behold the handmaid of the Lord; be it done to me according to thy word. And the angel departed from her. And Mary rising up in those days, went into the hill country with haste into a city of Juda.Luke 1:34-39

I might add, Our Blessed Mother, the Immaculate Conception did not even take a moment to enjoy this glory, it was not for her, but for Him. She said her yes and then merely saw that there was a duty to do so went straight away to help her cousin Elizabeth in her last months prior to the birth of John the Baptist, the precursor of Christ, the one who would prepare the people for  Christ's public life. Later we hear the beautiful words of the Magnificat:

My soul doth magnify the Lord. And my spirit hath rejoiced in God my Saviour.
Because he hath regarded the humility of his handmaid; for behold from henceforth all generations shall call me blessed. Because he that is mighty, hath done great things to me; and holy is his name. And his mercy is from generation unto generations, to them that fear him. He hath shewed might in his arm: he hath scattered the proud in the conceit of their heart. He hath put down the mighty from their seat, and hath exalted the humble. He hath filled the hungry with good things; and the rich he hath sent empty away. He hath received Israel his servant, being mindful of his mercy: As he spoke to our fathers, to Abraham and to his seed for ever.Luke 1: 46-55