成功不是终点，失败也不是致命的，重要的是继续前进的勇气。

The most important thing in entrepreneurship is persistence.

Failure gave me an inner security that I had never attained by passing examinations. Failure taught me things about myself that I could have learned no other way. I discovered that I had a strong will, and more discipline than I had suspected; I also found out that I had friends whose value was truly above the price of rubies.

理论计算机科学中的挑战不仅仅是解决问题，而是理解为什么它们难以解决。