The biggest risk is not taking any risk. In a world that’s changing quickly, the only strategy that is guaranteed to fail is not taking risks.

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.

幸福不仅仅是悲伤的缺席；它是意义的在场。

不要害怕失败，失败是成功的必经之路。