"The past is never dead. It's not even past."

There are only two kinds of people who are really fascinating—people who know absolutely everything and people who know absolutely nothing.

数学是宇宙书写其最深奥秘密的语言。

The true teacher defends his pupils against his own personal influence. He inspires self-trust. He guides their eyes from himself to the spirit that quickens him. He will have no disciple.