二战前生活很简单。之后，我们有了系统。

Conflict is the gadfly of thought. It stirs us to observation and memory. It instigates to invention. It shocks us out of sheeplike passivity, and sets us at noting and contriving.

阈限性是两个阶段之间的过渡状态，个体既不属于这里也不属于那里，处于两者之间。