社会系统是个人与个人之间、群体与群体之间关系的网络。

Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.

People are cruelest to those they love.

当你停下来思考你是否爱一个人时，你已经永远停止爱那个人了。

生命最伟大的礼物是能够想象它的另一种可能。