Read Luke 1:26-38
26 In the sixth month of Elizabeth’s pregnancy God sent the angel Gabriel to a town in Galilee named Nazareth. 27He had a message for a young woman promised in marriage to a man named Joseph, who was a descendant of King David. Her name was Mary. 28The angel came to her and said, “Peace be with you! The Lord is with you and has greatly blessed you!”
29 Mary was deeply troubled by the angel’s message, and she wondered what his words meant. 30The angel said to her, “Don’t be afraid, Mary; God has been gracious to you. 31You will become pregnant and give birth to a son, and you will name him Jesus. 32He will be great and will be called the Son of the Most High God. The Lord God will make him a king, as his ancestor David was, 33and he will be the king of the descendants of Jacob for ever; his kingdom will never end!”
34 Mary said to the angel, “I am a virgin. How, then, can this be?”
35 The angel answered, “The Holy Spirit will come on you, and God’s power will rest upon you. For this reason the holy child will be called the Son of God. 36Remember your relative Elizabeth. It is said that she cannot have children, but she herself is now six months pregnant, even though she is very old. 37For there is nothing that God cannot do.”
38 “I am the Lord’s servant,” said Mary; “may it happen to me as you have said.” And the angel left her.
As Mary hears the news of Jesus coming to birth through her she surrenders herself to God completely.
"I am the Lord's servant, may it happen to me as you have said..."