People of character do the right thing, not because they think it will change the world but because they refuse to be changed by the world.
Don't let others define you. Don't let the past confine you. Take charge of your life with confidence and determination and there are no limits on what you can do or be.
Living a life that matters doesn't happen by accident. It's not a matter of circumstance but of choice. Choose to live a life that matters.
I think Samuel Johnson had it right when he observed that hope is itself a species of happiness. So if we want to be happy it only makes sense to discipline ourselves to choose our attitudes, to think positively and to be hopeful.