WHILE THE SOUL-POWER IS EVERYWHERE, THE PRINCIPLE OF ACTION IS LOCALIZED IN THE SPECIAL ORGAN.
23. Since, for the body, being animated amounts to being penetrated by the light shed by the soul, every part of the body participates therein in some particular manner. Each organ, according to its fitness, receives the power suitable to the function it fulfils. Thus we may say that the power of sight resides in the eyes; that of hearing in the ears; that of taste in the tongue; that of smell in the nose; that of touch in the whole body, since, for the latter sense, the whole body is the organ of the soul. Now as the instruments for touch are the first nerves, which also possess the power of moving the organism, as they are the seat of this power; as, besides, the nerves originate in the brain, in the brain has been localized the principle of sensation and appetite—in short, the principle of the whole organism; no doubt because it was thought that the power which uses the organs is present in that part of the body where are the origins of these organs. It would have been better to say that it is the action of the power that makes use of the organs that originates in the brain; for that part of the body from which starts the movement impressed on the organ had to serve somewhat as a foundation for the power of the workman, a power whose nature is in harmony with that of the organ (it sets in motion); or rather, this part of the body does not serve as foundation for this power, for this power is everywhere, but the principle of the action is in that part of the body in which is the very principle of that organ.