Solemnity of the Lord's Annunciation

[I]n the Annunciation, the Child was not accepted in any unforeseen way, the Child was willed. There was a collaboration between a woman and the Spirit of Divine Love. The consent was voluntary under the Fiat; the physical cooperation was freely offered by the same word. Other mothers become conscious of motherhood through physical changes within them; Mary became conscious through a spiritual change wrought by the Holy Spirit. What is called the Annunciation was actually God asking for the free consent of a creature to help Him to be incorporated into humanity.

Ven. Fulton J. Sheen, “Life of Christ” pp. 22-23