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.

If you truly don't have competition, then zoom out until you can define some. Competition can be as simple as the reliance on the status quo, Microsoft (since at some point Microsoft will compete with everyone for everything), or researchers in universities. Pick something, because saying you have no competition at all is a nonstarter.

The most powerful sign is that your work no longer enchants you - it's not deep, delightful, and mutually satisfying. When this happens, it may be time to look for new challenges.

A successful self-publisher must fill three roles: Author, Publisher, and Entrepreneur—or APE.

Writing a book isn’t an easy process nor is it always enjoyable, but it is one of life’s most satisfying achievements.

There is only one Steve Jobs, but if you want a shot at being the next Steve Jobs, learn to communicate using stories, demos, and pictures.

I travel all the time.