We may find any number of excellent arguments against war. We may demonstrate conclusively that war as a process for achieving national aggrandizement is now entirely unnecessary, because applied science has opened the way for every nation to increase its wealth many times. But if arguments alone were sufficient to convince rulers, then war would have disappeared when the first flood of League propaganda was sluiced out on the world. The fact is that something more than the appeal to reason is required, for man contains passions, prejudices, greeds, and fears also.
-- Notebooks Category 11: The Negatives > Chapter 3: Their Presence in The World > # 349