我认为你能做的最好的事情就是对你所拥有的心存感激。
I think the best thing you can do is to be grateful for what you have.
人类需要悲伤,正如需要欢乐一样。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
The world is full of suffering, but it is also full of the overcoming of it.