In mathematics, the art of proposing a question must be held of higher value than solving it.

我再也不想喝到需要去戒酒的地步了。

The only person you should try to be better than is the person you were yesterday.

随机实验是因果推理的黄金标准，但它们并不总是可行的。

自由是做法律允许的事情的权利。