"The path to greatness is not always easy, but it is always worth it."

The beauty of topological insulators lies in their robustness; their surface states are protected against disorder and imperfections.

正确陈述的反面是错误陈述。但一个深刻真理的反面很可能是另一个深刻真理。

时间不是药，药在时间里。

Fairy tales are more than true: not because they tell us that dragons exist, but because they tell us that dragons can be beaten.

I'm not a poet. I'm a trapeze artist.

Have you given any thought to your future？

当我死去时，都柏林将写在我的心上。

To be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others.