市场不会奖励自满。

The deepest insights in mathematics often come from the most abstract theories.

保证失败的最好方法就是放弃。

We need to design policies that work with human psychology, not against it.

We teach a subject not to produce little living libraries on that subject, but rather to get a student to think mathematically for himself.

If you borrow something， try to return it in better shape than you received it. Clean it， sharpen it， fill it up.