知识最大的敌人不是无知，而是知识的幻觉。

Truth is stranger than fiction, but it is because Fiction is obliged to stick to possibilities; Truth isn't.

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

可持续性不仅仅是一个流行词，更是我们的责任。