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

一切都是一个学习的过程：每次你跌倒，它只是在教你下次站起来。

If the only prayer you said was 'Thank you', that would be enough.

自由是做法律允许的事情的权利。

Mathematics is not a spectator sport. You have to get involved.

The old-fashioned dictator does not exist under scientific management.

Fear can hold you prisoner, hope can set you free.