Failure is instructive. The person who really thinks learns quite as much from his failures as from his successes.

——署名公告〈关于实行党纪的命令〉，提醒党员遵守党纪，1924年3月18日

Never stop learning; the moment you do, you start falling behind.

"The reason death sticks so closely to life isn't biological necessity—it's envy. Life is so beautiful that death has fallen in love with it, a jealous, possessive love that grabs at what it can."

人类今天拥有自我毁灭的手段——要么是在完全疯狂的发作中，即在一场大战中，通过短暂的破坏发作，要么是通过对原子技术的粗心处理，通过缓慢的中毒和遗传结构的恶化过程。