The old saying is wrong—winners do quit, and quitters do win. Every new project (or job, or hobby, or company) starts out exciting and fun. Then it gets harder and less fun, until it hits a low point—really hard, and not much fun at all. And then you find yourself asking if the goal is even worth the hassle. Maybe you’re in a Dip—a temporary setback that will get better if you keep pushing. But maybe it’s really a Cul-de-Sac, which will never get better, no matter how hard you try.