数学中真正的挑战不是解决问题，而是提出正确的问题。

计算学习理论中的挑战在于理解学习算法的能力和局限性。

The worst enemy of life, freedom and the common decencies is total anarchy; their second worst enemy is total power.

地球形状的问题本质上是引力和旋转共同作用下的平衡问题。

绝不能为了短期利益而牺牲质量。

So why do I talk about the benefits of failure? Simply because failure meant a stripping away of the inessential. I stopped pretending to myself that I was anything other than what I was, and began to direct all my energy into finishing the only work that mattered to me.