If a man crosses a river and an empty boat collides with his, even if he is bad-tempered he will not be angry. But if there is a man in that boat, he will shout at him to steer clear. Anger arises when there is someone to blame. Empty your own boat as you cross the river of the world, and nothing can oppose you.

— Chuang Tzu, Chapter 20 – Mountain Trees

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