The joy of discovery in mathematics is unparalleled.

Success is not final, failure is not fatal: it is the courage to continue that counts.

每一本书都是一扇通往未知世界的门，一次探索未知的邀请。

I hope she'll be a fool—that's the best thing a girl can be in this world, a beautiful little fool.

If I waited for perfection, I would never write a word.

The story is told by the dead, and the dead have no need for lies.