Two thoughts about the Annunciation from the Patristic era. First, Origen (d 254) taught that “Mary’s holy confession in Luke 1:38 (“I am a handmaid of the Lord”) should be taken to mean “I am a tablet on which to be written.” (Elizabeth A. Clark, Reading Renunciation, p. 59). Mary as Scripture is a beautiful image not only of her but of how Scriptures are an incarnation of the Word, and Mary is the living Scriptures on whom the word is written: “ … written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts” (2 Corinthians 3:3). Not only does she keep God’s word written in the Law with all her heart (see Deuteronomy 30:10; 2 Kings 23:3; 2 Chronicles 34:31), her heart becomes the Scriptures on which God’s Word is written which enables the Word to become flesh (John 1:14)
St Ambrose of Milan (d 397) commenting on Luke 1:41 writes:
And it came to pass that, when Elizabeth heard the salutation of Mary, the infant leaped in her womb.
Note the distinctness of each of these words, and their particular significance. Elizabeth was the first to hear her voice; but John was the first to be aware of the divine favor. She heard in the natural manner; he leaped for joy because of the Mystery. She sees Mary’s coming, he the Coming of the Lord. (The Sunday Sermons of the Great Fathers, p. 412)