The richness I achieve comes from nature, the source of my inspiration.

The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. )

唯一存在的限制是你给自己设定的限制。

I don't need a reason to be kind.

Mathematics is not a deductive science—that's a cliché. When you try to prove a theorem, you don't just list the hypotheses and then start to reason. What you do is trial and error, experimentation, guesswork.

教育艺术必须转变为建立在人性永恒规律上的科学。