Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

疯狂就是重复同样的错误并期待不同的结果。

The world is full of stories, but the stories are all one.

智慧是对痛苦的理解，对喜悦的感激，以及对过去的接受。

不信你短短观察几天，就不如初次的印象好了。