Mary said, "Behold, I am the handmaid of the Lord. May it be done to me according to your word." Then the angel departed from her. (Lk 1:26-38)
https://bible.usccb.org/bible/readings/122023.cfm
My spiritual director, Fr Joe McCloskey, used to say about the Incarnation, that the whole universe held its breath to hear the response of Mary to the Angel. May we also say YES to God so that Christ can be born in us. O Key of David, opening the gates of God’s eternal Kingdom: come and free the prisoners of darkness!