After that comes the discipline of the mind. This is done by concentration. When the mind is thinking of something else and one wishes it to think on one specific thought, then the mind becomes very restless; it does not want to remain in one spot, for it has always been without discipline. As soon as one disciplines it, it becomes like a restive horse that one has to master. The difficulty starts when one tries to concentrate; it begins to jump, while at other times it only moves about. This happens because the mind is an entity. It feels as a wild horse would feel: "Why should I be troubled by you?" But the mind is meant to be an obedient servant, just as the body is meant to become an obedient tool to experience life with. If they are not in order, if they do not act as one wishes them to, then one cannot hope for real happiness, real comfort in life.