The first lesson of economics is scarcity: There is never enough of anything to satisfy all those who want it. The first lesson of politics is to disregard the first lesson of economics.

除了蜜蜂，我无所畏惧。

以物易物、互通有无的倾向是人类共有的，也是其他动物所没有的。

耳朵是负责听的，听了之后再加以审察，这叫做聪明。