奖赏不正确，没有鼓励作用；施刑不正确，也起不到惩戒作用。

设计市场需要经济理论和实践直觉的结合。

The truth is rarely pure and never simple.

Courage to fail is just as important as the will to succeed.

Sustainability isn't an option; it's our responsibility to the next generation.

数学之美不仅在于它描述世界的能力，还在于它揭示支配世界的隐藏结构的力量。