"I think that mathematicians are much more like artists than they are like scientists."

理解经济周期的关键在于理解冲击经济的本质。

我不是悲观主义者，我是一个受过悲观主义训练的乐观主义者。

The United States should not try to spread democracy around the world.

作品总是在变化。

学习在于改变介于刺激和反应之间的某些中介过程。