At his suggestion I read the Prussian general Karl von Clausewitz’s classic work On War. Clausewitz’s central thesis, that war was a continuation of diplomacy by other means, dovetailed with my own instincts. I relied on Wolfie to procure reading material for me and I fear that I took over his life, infringing on both his work and pleasure. But he was such an amiable, modest fellow that he never complained.