432. XLV. IN RESPECT TO HIS INTERIORS EVERY MAN IS A SPIRIT. Whoever duly considers the subject can see that as the body is material it is not the body that thinks, but the soul, which is spiritual. The soul of man, upon the immortality of which many have written, is his spirit, for this as to everything belonging to it is immortal. This also is what thinks in the body, for it is spiritual, and what is spiritual receives what is spiritual and lives spiritually, which is to think and to will. Therefore, all rational life that appears in the body belongs to the soul, and nothing of it to the body; for the body, as just said, is material, and the material, which is the property of the body, is added to and apparently almost joined to the spirit, in order that the spirit of man may be able to live and perform uses in the natural world, all things of which are material and in themselves devoid of life. And as it is the spiritual only that lives and not the material, it can be seen that whatever lives in man is his spirit, and that the body merely serves it, just as what is instrumental serves a moving living force. An instrument is said indeed to act, to move, or to strike; but to believe that these are acts of the instrument, and not of him who acts, moves, or strikes by means of the instrument, is a fallacy.