clausewitz. The material cause and result are just the hilt, and the spiritual cause and result are the precious metal, which is the real sharp blade. clausewitz, a military theorist, once said that material is the hilt of war, and spirit is the blade of war. If soldiers are compared to swords, bloody heroism is a sharp blade. Only when the sword does not roll the blade can we cut iron like mud and defend the frontier of the motherland.