If a man is crossing a river and an empty boat collides with his own skiff, even though he be a bad-tempered man he will not get angry. But if he sees a man in the boat, he will shout at him to steer clear. If the shout is not heard, he will shout again, and yet again, and begin to curse. And all because there is a man in the boat. If you can empty your own boat, you will not be in conflict with anyone in the world.
Daoist philosopher