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.

The more you know, the more you realize how little you know.

A philosophical problem has the form: 'I don't know my way about.'

经济理论提供工具，但现实世界的测试会完善它们。

蛇必须蜕皮才能成长。