Psychology must be based on observable phenomena, not abstractions.

简单不是缺乏复杂，而是对复杂的解决。

I want to liberate America from fear. I want people to be afraid of the things that are really scary, like war and famine, not their neighbor because he has a different religion.

数学家的工作大多是孤独的追求，但它建立在许多其他人的工作之上。

人生最重要的是活得开心，其他都是次要。

史记

The greatest discovery of my generation is that a human being can alter his life by altering his attitudes.