Several years ago when the Southern California economy took a downturn, Pastor Bob Johnson saw not only difficulty but also opportunity. So he scheduled a meeting with the mayor of his city and asked, “What can our church do to help you?” The mayor was astonished. People usually came to him for help. Here was a minister offering him the services of an entire congregation.

Together the mayor and pastor came up with a plan to address several pressing needs. In their county alone, more than 20,000 seniors had gone the previous year without a single visitor. Hundreds of foster children…