It is necessary to keep our life pure, and the five purifications should be done very carefully: the purification by air, the purification by water, the purification by earth, the purification by fire, and the purification by ether. A person is often inclined to neglect that which does not bring an immediate result that he can see with his eyes. But these purifications should be done very exactly. Washing face and hands is not enough: every tube and vein of the body must be kept clean. The postures and positions that are taught, the posture of the zikr, of the fikr, of shaghal, have the effect of making the blood flow through certain veins. If this is done there is no disease.