Yogis, who rise above the thoughts and feelings of those around them, attain power by the control of the breath. So the method of the inner cult of Sufis also depends upon the science of breath. Knowledge of another person's pleasure or displeasure, the message of affection, the warning of hostility, all are received by the way of the breath. The one who is conscious of the rhythm of breath and whose breath is pure from grossness, begins to perceive a sense which becomes, in time, a language to him.