In short, Sufism means to know one's true being, to know the purpose of one's life, and to know how to accomplish that purpose. Through disappointment many say, "I shall probably never be successful in my life", not realizing the fact that man is born to do what he longs to do, and that success is natural while failure is unnatural. When man is himself, the whole world is his own; when he is not himself, then even this self does not belong to him. Then he does not know what he is, where he is, nor why he is here on earth; then he is less useful to himself and to others than a rock.