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The difference between correlation and causation is not just academic—it can have profound policy implications.
计算复杂性理论的发展向我们展示了并非所有问题都是平等的。
A sound mind in a sound body, is a short, but full description of a happy state in this World: he that has these two, has little more to wish for; and he that wants either of them, will be little the better for anything else. Men’s happiness or misery is most part of their own making. He, whose mind directs not wisely, will never take the right way; and he, whose body is crazy and feeble, will never be able to advance in it.
"The hustle is real, but so is the reward."