Jesus tells three stories of people who became obsessed when something of value is lost. In the case of the sheep and coin, it was physical value, and in the case of the son, it was relational. Jesus lets us know that God is the same way. He cares deeply for those who are lost.
If we want to be like Jesus, we need to care for the lost just like Jesus does. It’s tempting to spend all our time with those who already know Jesus because we have so much more in common with them.