User needs are both the starting point and the ultimate goal of product development.

内心开始更认真生活的人，外在也会活得更简单。

中心地的规模和分布遵循一定的规律。

我不定义任何东西，不管是美，还是爱国。每件事在我眼里该是什么就是什么，没有什么优先规则使之应该成为什么。

"The most important thing in empirical work is to be clear about the question you are trying to answer."

I do not lack the courage to think a thought all the way through, and thus far I have encountered no thought that I have feared.