In the Gospel for the Fourth Sunday of Advent, the Angel Gabriel announces the birth of Jesus to Mary.  ” ‘Hail, full of grace! The Lord is with you.’  But she was greatly troubled at what was said and pondered what sort of greeting this might be.  Then the angel said to her, ‘Do not be afraid, Mary, for you have found favor with God.  Behold, you will conceive in your womb and bear a son, and you shall name him Jesus’ ” (Luke 1: 28-31).  Mary of Nazareth was a teenage girl from a small rural village.  No one would have expected her to give birth to the Son of God.  Yet God chose her.  Filled with the grace of God, she responded wholeheartedly.  With the grace of God, all things are possible.  By Baptism in the Holy Spirit, Christians are full of God’s grace.  We are not always as open to the power of God’s grace as Mary was.  How do you close your heart to God’s grace?  How do you open it?