States are rational actors that seek to maximize their relative power in order to ensure their survival in a competitive international system.

道德的目的是教你，不是受苦和死亡，而是享受自己和生活。

The key to happiness is gratitude.

The idea of justice is not the same as the idea of law.

释义：天地顺自然而动，所以日月运行不会有差错，四季的更替也不会有差错。圣人顺自然之理而动，则刑罚清明而百姓顺服。