I see this as the central issue of our time: how to find a substitute for war in human ingenuity, imagination, courage, sacrifice, patience... War is not inevitable, however persistent it is, however long a history it has in human affairs. It does not come out of some instinctive human need. It is manufactured by political leaders, who then must make a tremendous effort--by enticement, by propaganda, by coercion--to mobilize a normally reluctant population to go to war.