The most important thing in communication is hearing what isn't said.

There is no absolute fairness in life, but it is relatively fair.

条件作用原理同样适用于所有物种。

The structure of the international system forces states to behave in certain ways, regardless of their internal characteristics.

我总是很高兴地想到，我的教育大部分是非正式的，并且根植于现实世界。

释义：他认为气不仅是万物的起源，也是万物的归宿，万物在气的循环中生生不息。