I have a friend who writes to me from time to time. He has lived a long life and gone throughmany hardships and struggles. Now he is dealing with health issues that have left him tired anddepressed. He ended his last letter to me with this question: “Does anything we do in this lifereally make a difference?”When I read those words my mind suddenly flashed back to last summer. My youngest sonhad accidentally broken a window in our house and I had taken it to the only place I knew thatreplaced window panes. While the guy worked on getting the glass cut I walked across thestreet to a store for a snack. I walked back and stopped at the corner to check for traffic.Suddenly, I not...