Every now and then, someone does respond in a radical and unexpected way. Dr. Fred Craddock tells the story of a medical student who heard the call and made a radical response. A young woman came to him after hearing his sermon on today's text. She had decided to leave medical school and go to work among migrant workers in the Rio Grande Valley. Dr. Craddock did not manipulate her unexpected response. Instead, they talked for a long time about the meaning of her decision. Her parents were, understandably, furious with the new direction her life had taken. Like those fishermen, however, she heard the call and she stayed with it.

And there have been others. People in the western tradition have long known about Francis of Assisi. He turned from a life of luxury to one of voluntary poverty wi…