"If you wish to get something done, stop telling yourself why you can't. Begin telling yourself why you must... Of course there are obstacles to every achievement. Yet you can work through any obstacle when you have a clear and compelling reason to do so... Zero in on that reason. Make it your priority to keep that reason ever present in your thoughts... Though the challenges may be powerful, you can always make your purpose even more powerful. Keep telling yourself, again and again, why you must... Make a solid connection between your actions and your purpose. That will cause your effectiveness to soar... Remember always why you must. And you will." 

-- Ralph Marston