The secret of this question can be found by analyzing oneself. By studying the self one will find that the body is only a cover over one's real self. But by a still more profound study one will find that even one's mind is a cover over one's real self. As soon as one finds this out, one will become independent of the body as a means to live. Also, one will become independent of the mind to live. "But", one might ask, "if there is no body, then what is life?" One asks this because man has limited himself by experiencing life through the body, and has not tried to experience life without its help. When man is not conscious of his body, then he is conscious of his mind. When the eyes are open he is looking at things before him. When his eyes are closed then he is pondering upon what his mind has gained. In both cases he is dependent either upon his body or upon his mind to live, and this dependence makes the soul limited. It not only limits it, but it makes the soul mortal. In reality the soul is not mortal, but if the soul believes in mortality it is just like being mortal.