Among the different kinds of physical culture known to the modern world there is nothing that teaches the method, the way, the secret of sustaining an action. For instance, to be able to sit in the same posture without moving, to be able to look at the same spot without moving the eyes, to be able to listen to something without being disturbed by something else, to be able to experience hardness, softness, heat, or cold, keeping even vibrations, or to be able to retain the taste of salt, sweet and sour. Since all these experiences come and go, man has no control over his means of pleasure or joy. He cannot enjoy any experience through any sense as long as he wishes to enjoy it. So he depends upon all outer things, and has no control sustaining the experience he has. If there is any way of sustaining experience, it is through control.