In Luke 15:1-3, The Pharisees and the teachers of the law were complaining about Jesus. They were complaining that Jesus, who is perfect, sinless, and Holy is hanging out with people who were not worthy.
They could not figure out why God would have any interest in “bad” people. Jesus responds with three stories:
Luke 15:3-7 The Parable of the Sheep
Why would the shepherd leave his flock to look for one lost sheep?
Luke 15:8-10 The Parable of the Lost Coin
Why would you turn your house upside down for a coin?
Luke 15: 11-24 The Parable of the Lost Son
Why would you run to welcome your “lost” son?
God is saying “I hang out with them because I am who I am. I am grace.” Grace. Worth is not earned. Salvation is not earned. It is only received.