Isaiah 9 contains one of the Messianic prophecies given in the Old Testament about the coming of Christ, and it compares his arrival to a great light coming on the earth:
“The people walking in darkness have seen a great light; on those living in the land of deep darkness a light has dawned”
The continuous lighting of candles on the wreath throughout Advent signifies the increase of light pouring into the world as Christ’s arrival draws near. Lighting the candles one by one over the four weeks symbolizes the posture of anticipation we adopt in this season. The flame of each candle pushes back the darkness, and by Christmas Day, the fully illuminated wreath radiates a brightness to serve as a reminder that the Light of the World came to defeat darkness forever and dwell with his people.