Power of Good Intention?

Some of your have heard or read about the effect of possessing such a belief/power which some philosophical minds argue is the key/shortcut for the few successful people who affect the the rest of society. Such minds claim it doesn't matter how old you are or what gender you are or what race you are. Does this work? How can you change your belief system to increase your success in your personal and profession life? For men, I'd have say it the mind, personality and character that wins peole and success. Being in shape, and physically healthy can help, but it's the mind that knows how to use such physical health to one's advantage. I would like to hear some success story.