随机实验是因果推理的黄金标准，但它们并不总是可行的。

A method of solution is perfect if we can foresee from the start, and even prove, that following that method we shall attain our aim.

Injustice is relatively easy to bear; what stings is justice.

真正的旅程不是寻找新的风景，而是拥有新的眼光。

比起知识本身，我对能用知识做什么更感兴趣。