All history has been a history of class struggles, of struggles between exploited and exploiting, between dominated and dominating classes at various stages of social development.
至今一切社会的历史都是阶级斗争的历史，即剥削阶级和被剥削阶级之间、统治阶级和被压迫阶级之间斗争的历史。
普通和非凡的区别在于那一点点额外的努力。
We run so the world can leap.
最深刻的发现往往来自于提出最简单的问题。
在数学中，从问题到答案的旅程往往比答案本身更具启发性。