The books that the world calls immoral are books that show the world its own shame.

A good director is like a good conductor; he doesn't make a sound, but he makes the orchestra sound great.

无产阶级平等要求的实际内容都是消灭阶级的要求。

I hear music in everything.

宇宙是无限多样的。

The use of a program to prove the 4-color theorem will not change mathematics - it merely demonstrates that the theorem, a challenge for a century, is probably not important to mathematics.

——〈上李鸿章书〉，1894年1月