The ego is trained by a Sufi as a horse is trained by man. A bridle is put upon it and man holds the reins in his hand. This training is called by the Hindus Hatha Yoga, which means to gain the control of one's self by means of abstinence. Often, when man does wrong, it is not that he likes to do wrong, but that he is not able to prevent himself from acting in that way. In the first place, wrongdoing is almost always the consequence of the appetites and passions, or for the gratification of vanity. Fasting and special postures are often practiced by the mystics for the same reason. The more man gives way to the appetites and passions the more he is enslaved by them, until he reaches a state where he speaks and acts against his own conscience. Such faults as treachery, flattery, falseness, and all others of the kind come from lack of will-power and from giving way to the passions.