"The difference between correlation and causation is fundamental in empirical work."

金钱从来不会捉弄人，它只是使他们变得显赫。

每个故事都有开始、中间和结尾，但不一定是这个顺序。

Mathematics is the language in which God has written the universe.

世界因你的榜样而改变，而不是因你的观点而改变。