The only real failure is not trying.

To be a moral human being is to pay, be obliged to pay, certain kinds of attention.

In mathematics, the simplest questions often lead to the most profound discoveries.

Global hunger won't be solved by charity alone - it requires systemic change.

我是那种会为自己人挡子弹的人，如果你越界，我也会要你的命。

An invention can be so valuable as to be worthless to the inventor.

实现明天理想的唯一障碍是今天的疑虑。