人最重要的品质是勇气。没有它，其他品质都毫无价值。

History is that certainty produced at the point where the imperfections of memory meet the inadequacies of documentation.

记忆不仅是个人的事情，也是集体的事情。

Sometimes we measure things and see that in the short term they actually hurt sales, and we do it anyway.

The psychologist must be a meticulous observer.