Know the problem that you're trying to solve and fall in love with it. Don't flirt around it, don't think about the money, don't think about any of that stuff. Think about what you're trying to solve.

Be really, really, really good about that. Go very narrow. Think about it, go broad, but really narrow in on one thing that you can be really good at and solve. The moment that you lose your focus on that, you start to run into problems.