To improve is to change; to be perfect is to change often.
欲求新,则求变。欲求完美,求常变。
The most important quality for a researcher is persistence.
I have always been a prisoner of poetry.
一个好的数学家是能看到定理之间类比的人;一个伟大的数学家是能看到类比之间的类比的人。