Dear Friends,If this planet is to survive, it is imperative(必需的, 必要的)that we find paths to peace. It seems obvious that among persons and nations of good will, peace would be an easy destination to reach. Yet our world has had a history of war and violence from the beginning to the present. Why war and not peace? What are the impediments(障碍) to peace? I hope that we can try to deal with some of these questions in future columns. They are many and complex.