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"Causal inference requires careful thought about the assumptions underlying your analysis."
不理解一个人,就往往会把他当成傻瓜。
正该来时,先生(老子)应时来到这世间;正该去时,先生顺时离开这世间。安于时势,顺应自然规律,哀乐就不能进入心中。
The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.
Art is not what you see, but what you make others see.