Summary: How God came to Mary aand changed her life to bring us His Only Son.
How God stepped into change our world
The Angel Appears to Mary
Luke 1:26-38 Six months after Elizabeth had become pregnant, God sent the angel Gabriel to Nazareth, a city in Galilee.  The angel went to a virgin promised in marriage to a descendant of David named Joseph. The virgin’s name was Mary.  When the angel entered her home, he greeted her and said, "You are favored by the Lord! The Lord is with you."  She was startled by what the angel said and tried to figure out what this greeting meant.  The angel told her, "Don’t be afraid, Mary. You have found favor with God.  You will become pregnant, give birth to a son, and name him Jesus.  He will be a great man and will be called the Son of the Most High. The Lord God will give him the throne of his ancestor David.  Your son will be king of Jacob’s people forever, and his kingdom will never end."  Mary said to the angel, "But how? I’ve never slept with a man."  The angel answered her, "The Holy Spirit will come to you, and the power of the Most High will overshadow you. Therefore, the holy child developing inside you will be called the Son of God.  "Elizabeth, your relative, is six months pregnant with a son in her old age. People said she couldn’t have a child.  But nothing is impossible for God."  Mary answered, "I am the Lord’s servant. Let everything you’ve said happen to me." Then the angel left her.
We hear first of the promise that God gave for Jesus to be born way back in Genesis 3:15
“He will crush your head, and you will bruise his heel." All through the Old Testament the people were looking for One who could defeat the evil one we know as the Devil. Many things were foretold about this One who would come. Then there were 400 years when there was no voice or writing from God. Mary was a young girl who was pledged to a man named Joseph. It would seem that she was making preparations for that big day when she would officially become his wife. God had different plans for Mary. God is like that for I know that myself and perhaps many of you had our lives planned as to what we were going to do until God entered and changed our lives for His divine purposes. Mary was visited by an angel. Remember no one had received a word from God for over 400 years and so I am sure Mary was startled when this heavenly being appeared to her. Think of being in her place when the angel told her she would be the mother of the Son of God.
We want to go back a few verses to see how God was setting all this up so let us look at Luke 1:20-25 But because you didn’t believe what I said, you will be unable to talk until the day this happens. Everything will come true at the right time."  Meanwhile, the people were waiting for Zechariah. They were amazed that he was staying in the temple so long.  When he did come out, he was unable to speak to them. So they realized that he had seen a vision in the temple. He motioned to them but remained unable to talk.  When the days of his service were over, he went home.  Later, his wife Elizabeth became pregnant and didn’t go out in public for five months. She said,  "The Lord has done this for me now. He has removed my public disgrace."