二战前生活很简单。之后，我们有了系统。

I never guess. It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.

整体不同于其部分的总和。

The precepts of the law are these: to live honestly, to injure no one, and to give each his due.

成功不在于规模最大，而在于在你所做的领域做到最好。

实现任何有价值的事情的三个重要要素是：努力工作、坚持不懈和常识。

数学是理性的音乐。