There are two powerful centers connected with the vagus nerve: the heart center and the center at the base of the spine. These two, when brought under the control of the soul, functioning through the head center (the [336] brahmarandra), produce the raising of the kundalini fire. This, when taking place, swings the entire nervous system into a special form of rhythmic activity and responsiveness, and it is through the stimulation and the control of the vagus nerve that this is accomplished. It is not the vagus nerve which is instrumental in raising the kundalini fire, but the reverse situation. When the head, the heart and the center at the base of the spine are in magnetic and dynamic rapport, producing a radiatory effect, then they affect the vagus nerve and the fires of the body are unified and raised, producing purification and the "opening of all doors."