I was worth about over a million dollars when I was 23 and over ten million dollars when I was 24, and over a hundred million dollars when I was 25 and... it wasn't that important — because I never did it for the money.

The customer is the final inspector.

All the work I've done in my life will be obsolete by the time I'm fifty.

There's no other company that could make a MacBook Air and the reason is that not only do we control the hardware, but we control the operating system. And it is the intimate interaction between the operating system and the hardware that allows us to do that. There is no intimate interaction between Windows and a Dell notebook.

The mark of an innovative company is not only that it comes up with new ideas first, but also that it knows how to leapfrog when it finds itself behind.

It's hard to tell with these Internet startups if they're really interested in building companies or if they're just interested in the money. I can tell you, though: If they don't really want to build a company, they won't luck into it. That's because it's so hard that if you don't have a passion, you'll give up.

The web is just going to be one more of those major change factors that businesses face every decade.