“Return to your home, and declare how much God has done for you.” And he went away, proclaiming throughout the whole city how much Jesus had done for him.
Jesus gave a simple command to this former demoniac: "Share your story, giving God the credit for what has happened to you." And Luke gives us an insight into the nature of Jesus - clear attestation to Christ's deity. The men tells what God had done by telling what Jesus had done for him. He became not only an evangelist, but a witness to the truth that Jesus is God in the flesh.
Often the simplest ministry is the most powerful one. The man returned home to the people who knew him well. They had seen him come under the control of demons. They fearfully witnessed his rage, self-loathing, and uncontrollable frenetic madness as demons took him over and tortured his soul. And then, after being healed by Jesus, this same man returns to them healed by God and transformed by the touch of the Savior. His undeniable transformation was a powerful story, a means for Jesus' love and power to be known, and had an impact on an entire city.
Simple obedience, simple worship, and a life transformed by Jesus brought good news to an entire city. And so it can be if each of us Christians would just embrace the simple ministry of saturating our conversations and interactions with people with the good news of what God has done for us. The gospel advances and lives are changed by such simple obedience and the joy of sharing our stories.