Every mathematical problem is a window into a deeper understanding of the world.

Politics is almost as exciting as war, and quite as dangerous. In war you can only be killed once, but in politics many times.

我觉得唱歌是一种情感的宣泄，是一种表达自我的方式。

Thinking is behavior. The muscular habits learned in overt speech are responsible for implicit or internal speech (thought).