Sometimes the things that are most real are the things you can't see.
有时候最真实的东西反而是你看不见的。
The pursuit of power is the primary goal of states in the international system.
学习如何生活，而不是如何生存。
应对恐惧的唯一方法是直面它。
真理是所有伟大艺术的基础。