In mathematics, the journey is often more important than the destination.

I have come to believe that a great teacher is a great artist and that there are as few as there are any other great artists. Teaching might even be the greatest of the arts since the medium is the human mind and spirit.

The study of mental processes requires both experimental and comparative methods.

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.

人们可以非常聪明或拥有直接适用的技能，但如果他们不真正相信它，那么他们就不会真正努力工作。

人类生命的进程不仅由驱动力或环境决定，还由创造性的自我导向决定。

质量从来不是偶然的；它始终是智慧努力的结果。