I'm convinced that about half of what separates the successful entrepreneurs from the non-successful ones is pure perseverance... Unless you have a lot of passion about this, you're not going to survive. You're going to give it up. So you've got to have an idea, or a problem or a wrong that you want to right that you're passionate about otherwise you're not going to have the perseverance to stick it through.

Probably death is the best invention of life.

So [Polaroid's Dr. Edwin] Land, at 75, went off to spend the remainder of his life doing pure science, trying to crack the code of color vision. The man is a national treasure. I don't understand why people like that can't be held up as models: This is the most incredible thing to be - not an astronaut, not a football player - but this.

These technologies can make life easier, can let us touch people we might not otherwise. You may have a child with a birth defect and be able to get in touch with other parents and support groups, get medical information, the latest experimental drugs. These things can profoundly influence life. I'm not downplaying that.

What this means is that people are seeing a stable business, which is good, and a business that is in control, which is also good.

Technology is nothing. What's important is that you have a faith in people, that they're basically good and smart, and if you give them tools, they'll do wonderful things with them.

I thought deeply about this. I ended up concluding that the worst thing that could possibly happen as we get big and as we get a little more influence in the world is if we change our core values and start letting it slide, I can't do that. I'd rather quit.