Every generation has its defining works. More than 300,000 people worked to put a man on the moon - including that janitor. Millions of volunteers immunized children around the world against polio. Millions of more people built the Hoover dam and other great projects. These projects didn't just provide purpose for the people doing those jobs, they gave our whole country a sense of pride that we could do great things.

We understand the great arc of human history bends towards people coming together in ever greater numbers - from tribes to cities to nations - to achieve things we couldn't on our own.

Google's done a super good job on search; Apple's done a great job on the IPod.

The death knell for any enterprise is to glorify the past - no matter how good it was.

If you can believe in something great, then you can achieve something great.

Sometimes if you want to achieve something great, there will be curveballs. You just have to dodge them every once in a while.