免费的疫苗比昂贵的治疗更有价值，但更难推广。
当我停止相信自己能赢的那一天，就是我停止打网球的那一天。
I'm alive and I have a chance to do something with my life. That's the only motivation I need.
"A writer is essentially a person who writes not because he has to, but because he cannot not write."
组合数学是不用计数的计数艺术。
A company's biggest cost is the opportunity cost of slow decisions.
Wealth is not about having a lot of money; it's about having a lot of options.