You can see all the lectionary readings for the Third Sunday of Advent, Year C by clicking here. I have chosen to discuss the passage from the Gospel of Luke.
John is baptizing huge crowds at the river. He speaks harshly to them, calling them snakes and telling them to change their hearts and lives. They ask him what they should do.
He tells them if they have two shirts, they should share with someone who has none and to share food, too.
Tax collectors come and ask what to do and he tells them not to take more taxes than they are supposed to collect. Soldiers ask what to do and he tells them not to extort people for money by force.
People begin to speculate that John was the Messiah, but he tells them he baptizes in water but someone is coming who can do much more.
I am not good enough to be the slave who unties his sandals. He will baptize you with the Holy Spirit and with fire.Luke 3:16 (Easy-to-read version)
He continues to preach and baptize, calling on people to change and telling them the Good News.
This week of advent we see the importance of John the Baptist in preparing the way for Jesus, as we prepare our hearts for his arrival at Christmas. John emphasized repentance, a changing of the heart, and its evidence was in our behavior and good works. We are to share what we have and not use our privilege for evil. The emphasis is on love and caring as opposed to grasping and greed. Go and do likewise.