热爱真理,但宽恕错误。
国家本质上是侵略性和扩张主义的,因为它们存在于一个无政府状态的国际体系中,没有更高的权威来约束它们。
The only limit to our realization of tomorrow will be our doubts of today.
宇宙不仅比我们想象的更奇怪,而且比我们能够想象的还要奇怪。
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.