“The brain does not want the body to expend its resources unless we have a reasonable chance of success. Our physical strength is not accessible to us if the brain does not believe in the outcome, because the worst possible thing for humans to do is to expend all of our resources and fail. If we do not believe we can make it, we will not get the resources we need to make it. The moment we believe, the gates are opened, and a flood of energy is unleashed. Both hope and despair are self-fulfilling prophecies.”