It is not from the benevolence of the butcher， the brewer， or the baker that we expect our dinner， but from their regard to their own interest.

——《在广州中国国民党恳亲大会的演说》（1923年10月15日）

"The only way to deal with the unfree world is to become so absolutely free that your very existence is an act of rebellion."

In mathematics, the journey is often more important than the destination.

可持续性不仅仅是种树，而是在正确的地方为了正确的理由种正确的树。