优秀的数学家应该既严谨又富有想象力。

Don't cry， I'm sorry， you must understand， I am sorry to deceive you so much， but this is life.

The secret of change is to focus all of your energy, not on fighting the old, but on building the new.

The moment you start following the crowd, you’re going to lose your originality.

无论什么年龄，人心只会向同样敞开的心敞开。

在存在的静默中，答案自然浮现。