事实上，我不知道如果没有数学我会做什么。
The truth is, I don't know what I would have done without mathematics.
If you're going to innovate, you have to be willing to fail. If you're going to try new things, then you have to be willing to accept that you might fail.
Optimists tend to interpret their troubles as transient, controllable, and specific to one situation. Pessimists, on the other hand, believe that their troubles last forever, undermine everything they do, and are uncontrollable.
