36. Tactics. Overcoming others by letting them defeat themselves. Let your enemy expand and be puffed up, and his collapse will be imminent. In martial arts, use the aggressive imbalanced attacks of your enemies against themselves. Let them perish of their own extreme action, self-seeking, etc. Give your opponent room to fail. -- paraphrased from Lao-Tzu
Another variation: Don't interfere with your enemy while he is in the process of defeating himself. -- possibly attributed to Napoleon
Yet another is: If your enemy's house is on fire, add gasoline and roast marsh-mellows in the flames.