"The Virgin Mary is called βιβλος του λογου της ζωης (the "book of the Word of life") by the Greek Church. The book of the Gospel, the book of Christ's origins and life, can be written and proclaimed because God has first written his living Word in the living book of the Virgin's being, which she has offered to her Lord in all its purity and humility-the whiteness of a chaste, empty page. If the name of Mary does not often appear in the pages of the Gospel as evident participant in the action, it is because she is the human ground of humility and obedience upon which every letter of Christ's life is written. She is the Theotokos, too, in the sense that she is the book that bears, and is inscribed with, the Word of God. She keeps her silence that he might resonate the more plainly within her."
-Erasmo Leiva Merikakis, Fire of Mercy, Heart of the Word: Meditations on the Gospel According to Matthew