In the Psalm we said: “Sing to the Lord a new song, for he has done marvelous things” (Psalm 98:1). Today we consider one of the marvelous things which the Lord has done: Mary! A lowly and weak creature like ourselves, she was chosen to be the Mother of God, the Mother of her Creator.
At the message of the angel, she does not hide her surprise. It is the astonishment of realizing that God, to become man, had chosen her, a simple maid of Nazareth; not someone who lived in a palace amid power and riches, or one who had done extraordinary things, but simply someone who was open to God and put her trust in him, even without understanding everything: “Here I am, the servant of the Lord; let it be with me according to your word” (Luke 1:38). That was her answer.
—from Pope Francis, as quoted in the book Mother Mary: Inspiring Words from Pope Francis