“There are five character flaws that are dangerous for a general. If he is reckless, his men can be killed. If he is cowardly, his army can be captured. If he is short-tempered, he will react in anger. If he is self-important, he can be deceived. If he is attached to his men, he will hesitate at a crucial moment. These five flaws are certainly unfortunate for a general because they cause great destruction in war. These five flaws cause generals to fail and armies to die. Consider them well.”
Sun Tzu, The Art of War