Will-power is systematically developed by first disciplining the body. The body must sit in the prescribed posture; it must stand in the place it is asked to stand in. The body should not become restless, tired, by what is asked of it, but it should answer the demands of the person to whom it belongs. The moment the Sufi begins to discipline the body, he begins to see how undisciplined it always was; then he finds out that this body which he has always called "mine", "myself", and for whose comfort he has done everything he could, that this infidel seems to be most disobedient, most faithless.