The Influence and Control of the Eight Consciousnesses on the Physical Body

When the physical body lacks body consciousness, the body can still have slight movements. For example, some sentient beings have their heads cut off, yet the body can still twist and writhe. This is because when the manas grasps the body, although it cannot regulate the brain's central nervous system, the spinal nervous system still exists, so the manas controls the spinal nervous system to make the body twist and move; at this time, body consciousness and mind consciousness are not necessarily involved. Another example: after falling asleep, even in deep sleep, the body also exhibits slight movements, which also belong to nervous system activity. Talking in one's sleep in the middle of the night and the blinking of the eyelids are also unconscious activities, in which neither mind consciousness nor body consciousness arises.

Internal bodily activities, such as heartbeat, pulse, breathing, nervous system activity, gastrointestinal peristalsis, digestion and absorption, cellular metabolism, and so on, are generally autonomously regulated and sustained by the tathāgatagarbha; the seven consciousnesses often cannot exert any force over them. The activities of the internal organs do not require body consciousness—they continue even while asleep, otherwise the person would die. Many bodily activities cannot be dominated by body consciousness or mind consciousness, nor can they be dominated by the manas. A person's birth, aging, sickness, and death are all beyond the manas's control, let alone mind consciousness; all are carried out by the tathāgatagarbha in accordance with karmic seeds. Observe any function or operation within the body: if it does not obey our direction and control, then it is sustained solely by the tathāgatagarbha. Blood pressure and body temperature are like this—we cannot make them be however we wish, except for those with meditative concentration and supernatural powers, and except for those with strong mental power.

However, the emotional and psychological activities of the seven consciousnesses can influence and change the operation of the physical body's internal organs. The manas can influence and change the tathāgatagarbha's sustaining function over the physical body. The activities of the six consciousnesses are led by the manas and can also influence the tathāgatagarbha. The influence and regulation of the physical body's internal organs by the seven consciousnesses differs greatly from the tathāgatagarbha's manner of sustaining, controlling, and regulating. What is the difference? The tathāgatagarbha also listens to the sixth and seventh consciousnesses, and also to the five sense consciousnesses; that is why our cultivation is of use. Otherwise, everything would be fixed and unchangeable, and cultivation would be of no use. Through frequent sitting in meditation and quiet sitting, everything within the physical body can be changed. Cultivation is mainly done through effort on the sixth and seventh consciousnesses; when the sixth and seventh consciousnesses are well cultivated, earth-shaking transformations will occur, all the way to buddhahood.