你不能仅仅问顾客他们想要什么，然后试图满足他们。等你把产品开发出来时，他们可能已经想要新的东西了。

Psychology as the behaviorist views it is a purely objective experimental branch of natural science.

I'm pretty sure none of this would have happened if I hadn't been fired from Apple. It was awful tasting medicine, but I guess the patient needed it. Sometimes life hits you in the head with a brick. Don't lose faith. I'm convinced that the only thing that kept me going was that I loved what I did. You've got to find what you love. And that is as true for your work as it is for your lovers.

The only way to learn mathematics is to do mathematics.