War is the tao of deception. Therefore, when planning an attack, feign inactivity. When near, appear as if you are far away. When far away, create the illusion that you are near. If the enemy is efficient, prepare for him. If he is strong, evade him. If he is angry, agitate him. If he is arrogant, behave timidly so as to encourage his arrogance. If he is rested, cause him to exert himself. Advance when he does not expect you. Attack him when he is unprepared. —Sun-Tzu, The Art of War
