Every mental state exists for a purpose; to understand it, we must ask what function it serves in the broader system of behavior.

"Capitalism is the best system ever invented to lift people out of poverty."

The writer's secret is not inspiration—for it is never clear where it comes from—but stubbornness, endurance.

写作是一种乐观的行为。如果你觉得它不重要，你就不会费心去做。

初期教育应是一种娱乐，这样才更容易发现一个人天生的爱好。

我不是为孩子写作，我是为人写作。