You know you're ready to write a book when you have a feeling that you should do it, no matter what anybody says. It's like falling in love or starting a company. When you're still wondering if you should get married or you're still wondering whether you should start a company that might be not the right person or the right idea. And writing is the same way. When you've locked on to the topic, you'll just write it.

Ideas are easy. Implementation is hard.

The world is a big place. There are lots of smart people in it. Entrepreneurs are kidding themselves if they think they have any kind of monopoly on knowledge. And, sure as I'm a Macintosh user, on the same day that an entrepreneur tells this lie, the venture capitalist will have met with another company that's doing the same thing.

The companies that are successful, they start out to make meaning, not to make money.

You need to save some mental, physical, and emotional resources for enhancing your product after you ship. A revolution is a triathlon, not a hundred-yard dash-it requires long distance stamina and multiple skills such as creating, churning, and evangelizing.

Eat like a bird, poop like an elephant.

If you're an entrepreneur and you think that the president makes a difference to your business, you should stay at your current job.