The whole mechanism of the body works by the power of the breath, and every disorder in the working of the mechanism is caused by some irregularity in the breath. Therefore physicians feel disorder in the health of a patient by feeling his pulse or the beats of his heart. The physician will say that it is the physical illness of the body which has caused the change in the pulsation and in the beats of the heart, but the mystic knows that it is caused by the breath.