国际体系的结构迫使国家以某种方式行事，无论其内部特征如何。
Never confuse a single defeat with a final defeat.
Happiness， like unhappiness， is a proactive choice.
"A journey is just as important as the destination, perhaps more so."
感恩是一种简单的实践，可以对你的幸福感产生深远的影响。
一个观念的效用决定了它在精神生活中的地位。