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

要这样行动，使得你意志的准则任何时候都能同时被看作一个普遍立法的原则。

一个好句子是一个小小的奇迹。

忘记不是记忆力的问题，而是注意力的问题。