当你怀疑自己是否能飞的那一刻，你就永远失去了飞翔的能力。
The only way to have a good day is to start it with a positive attitude.
In mathematics, the journey is often more important than the destination.
我们写的每一个方程都是宇宙的一首诗，是存在伟大史诗中的一节。