If you're not willing to work hard, let someone else do it. I'd rather be with someone who does a horrible job, but gives 110% than with someone who does a good job and gives 60%.
Take up one idea. Make that one idea your life; dream of it; think of it; live on that idea. Let the brain, muscles, nerves, every part of your body, be full of that idea, and just leave every other idea alone. This is the way to success.