Obvious to you is amazing to others.
It's only a little difficult to say no. You've got to believe that the work you're doing is ultimately more useful to the world.
The most important lesson is probably to spend less than you earn.
Success comes from persistently improving and inventing, not from persistently promoting what’s not working.
Care about your customers more than about yourself, and you'll do well.
There is no movement without the first follower. See, we are told that we all need to be leaders but that would be ineffective. The best way to make a movement, if you really care, is to courageously follow and show others how to follow.