美国没有永恒的敌人，也没有永恒的朋友，只有永恒的利益。
The United States has no permanent enemies, no permanent friends, only permanent interests.
The human mind is so complex and things are so tangled up with each other that, to explain a blade of grass, one would have to make a diagram of the universe.
The most important political distinction among countries concerns not their form of government but their degree of government.
我总是尽量保持积极，享受每一刻。
If you think you’re the best, you’ll never be the best.
职位越高，错误的代价越大。
