The typical wreath has four candles set in the perimeter of an evergreen wreath for the four Sundays leading up to Christmas. A white candle is in the center for Chritmas Eve/Day. Usually there are three purple candles and one rose candle. A purple candle is lit the first Sunday of Advent during the worship service, and a subsequent candle is lit each Sunday until on the last Sunday before Christmas all four candles are burning during the service. The first candle for the first week represents hope, the second week peace, the third week (the rose colored candle) stands for joy and the final candle stands for love. This photo is taken from: https://i.pinimg.com/736x/ba/9f/d1/ba9fd15493835624f6ec7134bb4f401e--catholic-advent-wreath-diy-advent-wreath.jpg
Additional information on the history of Advent is available at:
https://en.wikipedia.org/wiki/Advent_wreath
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