Anarchy is the permissive cause of war; it creates an environment in which states have to rely on self-help to ensure their survival.

理论不应该试图解释所有事实，因为有些事实是错误的。

The past is always tense, the future perfect.

人生就是一连串的选择。

What matters in life is not what happens to you but what you remember and how you remember it.

做伟大的事情很困难，但指挥伟大的事情更困难。