I just cut, pasted, and printed Bob Parsons' 16 Rules to Live By, so I can put it up on my bulletin board as a daily reminder. They are simple—1. Get and stay out of your comfort zone; 2. Never give up; and 3. When you're ready to quit, you're closer than you think—but well worth keeping front of mind. Plus, they're pretty witty (I just put the bare basics of the first three here).