Quality is remembered long after price is forgotten.

你停止学习的那天就是你停止成长的那天。

We've done price elasticity studies, and the answer is always that we should raise prices. We don't do that, because we believe -- and we have to take this as an article of faith -- that by keeping our prices very, very low, we earn trust with customers over time, and that that actually does maximize free cash flow over the long term.

真理的概念在任何足够强大以包含算术的形式系统中都是不可定义的。

The essence of science is to ask the right questions.

我是一个喜欢不普通的人。