When Mary found out that she was pregnant with God’s Son, her response is somewhat muted: “Behold, the bondslave of the Lord; may it be done to me according to your word.” Mary appears to have had concerns about the matter, and it is not until after she visits her relative Elizabeth that her concerns are allayed and she is filled with joy and thanksgiving to the Lord for the great honour that is bestowed upon her: that she should carry the Messiah in her womb.
Mary’s song traces the same thread as the songs of Hannah and David before her, marvelling at the faithfulness of God towards those who serve Him; who exalts the humble and destroys the proud and those who are wise in their own estimation.