WHY BODIES ARE ACTIVATED BY INCORPOREAL POWERS.
The proof that bodies are activated only by incorporeal faculties may be proved as follows: Quantity and quality are two different things. Every body has a quantity, but not always a quality, as in the case of matter, (according to the Stoic definition, that it was a body without quality, but possessing magnitude[63]). Granting this, (you Stoic) will also be forced to admit that as quality is something different from quantity, it must consequently be different from the body. Since then every body has a quantity, how could quality, which is no quantity, be a body? Besides, as we said above,[64] every body and mass is altered by division; nevertheless, when a body is cut into pieces, every part preserves the entire quality without undergoing alteration. For instance, every molecule of honey, possesses the quality of sweetness as much as all the molecules taken together; consequently that sweetness cannot be corporeal; and other qualities must be in a similar case. Moreover, if the active powers were corporeal, they would have to have a material mass proportional to their strength or weakness. Now there are great masses that have little force, and small ones that have great force; demonstrating that power does not depend on extension, and should be attributed to some (substance) without extension. Finally, you may say that matter is identical with body, and produces different beings only by receiving different qualities (the Stoics considering that even the divinity was no more than modified matter, their two principles being matter and quality;[65] the latter, however, was also considered as body). How do you (Stoics) not see that qualities thus added to matter are reasons, that are primary and immaterial? Do not object that when the spirit (breath) and blood abandon animals, they cease to live; for if these things are necessary to life, there are for our life many other necessities, even during the presence of the soul (as thought Nemesius).[66] Besides, neither spirit nor blood are distributed to every part of the body.
THE SOUL CAN PENETRATE THE BODY; BUT TWO BODIES CANNOT PENETRATE EACH OTHER.
(10). The soul penetrates the whole body, while an entire body cannot penetrate another entire body. Further, if the soul is corporeal, and pervades the whole body, she will, with the body, form (as Alexander of Aphrodisia pointed out) a mixture,[67] similar to the other bodies (that are constituted by a mixture of matter and quality, as the Stoics taught). Now as none of the bodies that enter into a mixture is in actualization[68] the soul, instead of being in actualization in the bodies, would be in them only potentially; consequently, she would cease to be a soul, as the sweet ceases to be sweet when mingled with the bitter; we would, therefore, have no soul left. If, when one body forms a mixture with another body, total penetration occurs, so that each molecule contains equal parts of two bodies and that each body be distributed equally in the whole space occupied by the mass of the other, without any increase of volume, nothing that is not divided will remain. Indeed, mixture operates not only between the larger parts (which would be no more than a simple juxtaposition); but the two bodies must penetrate each other mutually, even if smaller—it would indeed be impossible for the smaller to equal the greater; still, when the smaller penetrates the larger it must divide it entirely. If the mixture operates in this manner in every part, and if no undivided part of the mass remain, the body must be divided into points, which is impossible. Indeed, were this division pushed to infinity, since every body is fully divisible, bodies will have to be infinite not only potentially, but also in actuality. It is therefore impossible for one entire body to penetrate another in its entirety. Now as the soul penetrates the entire body, the soul must be incorporeal (as thought Nemesius).[69]
THE STOIC DEVELOPMENT FROM HABIT TO SOUL AND INTELLIGENCE WOULD MAKE THE PERFECT ARISE FROM THE IMPERFECT, AN IMPOSSIBILITY.
(11). (If, as Stoics claim, man first was a certain nature called habit,[70] then a soul, and last an intelligence, the perfect would have arisen from the imperfect, which is impossible). To say that the first nature of the soul is to be a spirit, and that this spirit became soul only after having been exposed to cold, and as it were became soaked by its contact, because the cold subtilized it;[71] this is an absurd hypothesis. Many animals are born in warm places, and do not have their soul exposed to action of cold. Under this hypothesis, the primary nature of the soul would have been made dependent on the concourse of exterior circumstances. The Stoics, therefore, posit as principle that which is less perfect (the soul), and trace it to a still less perfect earlier thing called habit (or form of inorganic things).[72] Intelligence, therefore, is posited in the last rank since it is alleged to be born of the soul, while, on the contrary, the first rank should be assigned to intelligence, the second to the soul, the third to nature, and, following natural order, consider that which is less perfect as the posterior element. In this system the divinity, by the mere fact of his possessing intelligence, is posterior and begotten, possessing only an incidental intelligence. The result would, therefore, be that there was neither soul, nor intelligence, nor divinity; for never can that which is potential pass to the condition of actualization, without the prior existence of some actualized principle. If what is potential were to transform itself into actualization—which is absurd—its passage into actualization will have to involve at the very least a contemplation of something which is not merely potential, but actualized. Nevertheless, on the hypothesis that what is potential can permanently remain identical, it will of itself pass into actualization, and will be superior to the being which is potential only because it will be the object of the aspiration of such a being. We must, therefore, assign the first rank to the being that has a perfect and incorporeal nature, which is always in actualization. Thus intelligence and soul are prior to nature; the soul, therefore, is not a spirit, and consequently no body. Other reasons for the incorporeality of the soul have been advanced; but the above suffices (as thought Aristotle).[73]
II. THE SOUL IS NEITHER THE HARMONY NOR ENTELECHY OF THE BODY—THE SOUL IS THE HARMONY OF THE BODY; AGAINST THE PYTHAGOREANS.
(12). a. Since the soul is not corporeal, its real nature must be ascertained. Shall we assert that she is something distinct from the body, but dependent thereon, as, for instance, a harmony? Pythagoras, indeed, used this word in a technical sense; and after him the harmony of the body has been thought to be something similar to the harmony of a lyre. As tension produces in the lyre-strings an affection (or, manner of being, or state) that is called harmony, likewise, as contrary elements are mingled in our body, an individual mixture produces life and soul, which, therefore, is only an individual affection of this mixture.