The Fourth Angel of Advent
The fourth Advent angel is Gabriel, who appears to the Blessed Virgin.
Mary's simple response to God's invitation is the climax of the angel messages. At the Annunciation, the three previous messages come together as one. The Blessed Virgin realizes she is part of a spiritual battle. She hears the words of the angel — “Do not be afraid” and “With God all things are possible” — and her response is one of instant obedience, which requires faith and courage.
Let your speech always be gracious, seasoned with salt, so that you may know how you ought to answer everyone. Col 4:6