From Catholic Online: "Today we celebrate the beautiful solemnity of Mary, Mother of God. In reality, this solemnity allows us to reflect upon the essential reality of our Catholic Faith: Jesus, the Christ, is one person with two distinct natures: divine and human. This union of the two natures in the one person of Jesus is called the hypostatic union." Continued
Here is a beautiful musical interlude by the Benedictine Monks at Fotgombault, France.