I can give you an example of a man whom I have known who lacked a certain quality in his blood. The scientists and physicians had given up all hope of saving him, for without this quality he could not get better. By giving him injections they sometimes made him feel better, but his sensation of improvement was only outward, and therefore it could not last. Then this man began studying and practicing this science of which I am speaking, and after two or three years he found that that quality which had been lacking in his blood was now coming by itself.