必得之事,不足赖也;必诺之言,不足信也。
容易得到的东西,是靠不住的;轻易许下的诺言,不值得信赖。
The interplay between topology and symmetry in materials can lead to unexpected and exciting physical phenomena.
People demand freedom of speech as a compensation for the freedom of thought which they seldom use.
If you can keep your head when all about you are losing theirs and blaming it on you...
The difference between successful people and really successful people is that really successful people say no to almost everything.