Even if you're on the right track, you'll get run over if you just sit there. Stick to one thing until you get there. My interest is in the future, because I am going to spend the rest of my life there. I couldn't wait for success, so I went ahead without it. The measure of success is not whether you have a tough problem, but whether it's the same problem you had last year.
Successful people keep moving.
They make mistakes, but they don't quit. When one teaches, two learn.