Pope Benedict XVI called the Annunciation “the greatest event in our history,” because it was through Mary’s “fiat” that salvation entered the world. In this video, Jeff Cavins, founder of The Great Adventure Bible Timeline, encourages viewers to also say “yes” to God’s will. That openness to God in our lives can lead to Christ entering in and changing everything within us and around us. The Incarnation, as well as Jesus’ entire life, death, and resurrection, began with Mary’s willingness to let God enter in. What adventures are in store for us if we say “yes” to God?