Day 17

The third Candle on the Advent wreath is called the “Shepherd’s Candle.” Its light is a symbol of the Joy that filled the world in the past at the birth of Jesus- the joy that first came upon the shepherds at night watch in the fields when the Angel of the Lord appeared to them and said,
“Do not be afraid; for behold, I proclaim to you good news of great joy that will be for all the people.” Luke 2:10

This Candle is rose in color to remind everyone that the very joyful occasion of the Lord’s birth is truly at the heart of our Advent preparation of prayer and penitence, represented by the liturgical color purple.

https://www.thebestcatholic.com/2017/12/18/third-sunday-advent-joy