问题的数学表述通常比其解决方案更重要，后者可能仅仅是数学或实验技巧的问题。

If you ask an economist what’s driven economic growth, it’s been major advances in things that mattered – the mechanization of farming, mass manufacturing, things like that. The problem is, our society is not organized around doing that.

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.

选择一个简单的理念，矢志不渝地去执行。

The end of history will be a very sad time.