The only service a friend can really render is to keep up your courage by holding up to you a mirror in which you can see a noble image of yourself.

The only learning which significantly influences behavior is self-discovered, self-appropriated learning.

为了生存，我们必须适应。为了繁荣，我们必须创新。

我做事情不是为了得到反应或赞誉，而是因为我热爱做这些事。

Curiosity is the engine that drives scientific progress.

一个好的模型是准确性和简洁性之间的折衷。