The mind once enlightened cannot again become dark.

在快速变化的市场中，唯一不变的就是客户的需求。

你必须在别人不努力的时候努力，这样你才能在别人不发光的时候发光。

We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.

Success is a great deodorant.

翻译：修积善行的家族，必然留下许多庆祥；累积恶行的家族，必然留下许多祸殃。