When you solve a mathematical problem, you don't just get the answer - you understand why it's the answer.

The dead are never far from us. They're in our hearts and on our minds and they always will be.

创建和维持大型复杂组织的能力是区分成功社会与不成功社会的关键因素之一。

你无法控制你无法衡量的东西。

每个人犯了错误，都自称是经验。