我们都被年轻时的自己的幽灵所困扰。

我相信讲故事的力量。这是我们理解世界的方式。

数学中最重要的是理解概念，而不仅仅是记忆公式。

沉默的人拥有最掷地有声的头脑。

For the past 33 years， I have looked in the mirror every morning and asked myself: 'If today were the last day of my life， would I want to do what I am about to do today？' And whenever the answer has been 'No' for too many days in a row， I know I need to change something.