The highest form of ignorance is when you reject something you don't know anything about.
The best way to learn mathematics is to do mathematics.
The worst blindness is the blindness of those who do not want to see.
Mathematics is the art of giving the same name to different things.
现象学的本质在于其方法，而不在于其结果。
Don't be afraid of failure, be afraid of not having the courage to try.