1. After having discussed the doctrine of the ten categories (of Aristotle), and spoken of the (Stoics) who reduce all things to a single genus, and then distribute them in four species, we must still set forth our own opinion on the subject, striving however to conform ourselves to the doctrine of Plato.
PLOTINOS IS FORCED TO DEMONSTRATION OF HIS DIVERGENCE FROM PLATO.
If it were our opinion that essence was one, we would not need to study whether there was one single genus for all things, whether all genera could not be reduced to a single one; whether there were principles; whether the genera were at the same time principles; or whether all principles are genera, without saying conversely that all genera are principles; or, if we must distinguish between them, say that some principles are simultaneously genera, or some genera are principles, or, finally, whether all principles be genera without the genera being principles, and conversely. But, since we do not acknowledge that essence is one, the reasons[298] for which were advanced by Plato and other philosophers, we find ourselves forced to treat all these questions, and first to explain why we recognize genera of essences, and what number we decide on.
PLOTINOS ADDS TO ESSENCE ETERNITY, TO MAKE ESSENCE INTELLIGIBLE.
As we are going to treat of essence or essences, we must before everything else clear up the significance of essence, which we are now considering, and distinguish it from what other people mean by that word, which we would more likely call that which becomes, what is never genuine essence. And besides, it must be clearly understood that in making this distinction, we do not intend to divide a genus in species of the same nature; as Plato tried to do.[299] For it would be ridiculous to subsume under the same genus both essence and non-essence, or Socrates, and the image of Socrates. The kind of divisions here attempted will therefore only consist in separating things essentially different, as, for instance, explaining that apparent essence is not the same as the veritable Essence, by demonstrating that the latter's nature is entirely different. To clarify this its nature, it will be necessary to add to the idea of essence that of eternity, and thus to demonstrate that the nature of being could never be deceptive. It is of this kind of essence (that is, of the intelligible Essence), that we are going to treat, admitting that it is not single. Later[300] we shall speak of generation, of what becomes, and of the sense-world.
HIERARCHICAL CONSTITUTION OF THE UNIVERSE.
2. Holding as we do that the world-Essence is not one, we must face the question whether the number of beings is determinate, or infinite.
To say that world-Essence is not one, however, is to say that it is both one and multiple, a varied unity that embraces a multitude. It is therefore necessary that the One, so conceived, be one so far as it forms a single genus, containing as species the essences by which it is simultaneously one and multiple; or there must be several genera, but that they all be subsumed under the single one; or again, that there be several genera which however be not mutually subsumed, of which each, being independent of the others, may contain what is below it, consisting of less extended genera, or species below which there are no more than individuals; so that all these things may contribute to the constitution of a single nature, together making up the organization of the intelligible world, which we call world-Essence (or "being").
THE ELEMENTS OF THE UNIVERSE ARE PRINCIPLES AND GENERA SIMULTANEOUSLY.
Under these circumstances, the divisions that we establish are no more only genera, they are simultaneously the very principles of world-Essence; on the one hand they are genera, because they contain less extended genera, beneath which are species, which end in individuals; they are also principles, because world-Essence is composed of multiple elements, and because these elements constitute the totality of Essence. If it were only stated that world-Essence is composed of several elements, and that these elements, by co-operation, constitute the All, without adding that they branch out into lower species, our divisions would indeed be principles, but they would no longer be genera. For instance, if it be said that the sense-world is composed of four elements, such as fire, or other elements, these elements are indeed principles, but not genera, unless this name be used as a verbal similarity (or, homonym, or pun).
BEING ACTUALIZATIONS, BOTH GENERA AND INDIVIDUALS WILL BE DISTINCT.
Admitting therefore the existence of certain genera, which are simultaneously principles, we must still consider whether they should be conceived so that these genera, along with the things contained by each of them, commingle, fuse, and form the whole by their blending. If so, the genera would exist potentially, but not in actualization; none would have anything characteristic. Further, granting the distinctness of the genera, can we grant that the individuals blend? But what then would become of the genera themselves? Will they subsist by themselves, and will they remain pure, without mutual destruction of the mingled individuals? Later we shall indicate how such things could take place.
FUNDAMENTAL UNITY OF GENERA WOULD DESTROY SPECIES; MANIFOLDNESS MUST PRE-EXIST.
Now that we have explained the existence of genera, which, besides, are principles of being, and that from another point of view there are principles (or elements), and compounds, we shall have to set forth the criterion by which we constitute these genera; we shall have to ask how they may be distinguished from each other, instead of reducing them to a single (principle), as if they had been united by chance, although it does indeed seem more rational to reduce them to a single (principle).
It would be possible to reduce them in this way if all things were species of essence, if the individuals were contained within these species, and if there were nothing outside of these species. But such a supposition would destroy the species--for such species would no longer be species, or forms;--and from that moment there would be no further need for reducing plurality to unity, and everything forming a single unity; so that, all things belonging to this One, no being outside of the One would exist, as far as it was something else.
How indeed could the One have become manifold, and how could it have begotten the species, if nothing but it existed? For it would not be manifold if there were not something to divide it, such as a size; now that which divides is other than that which is divided. The mere fact that it divides itself, or imparts itself to others, shows that it was already divisible before the division.
THERE IS MORE THAN ONE GENUS, FOR NOT EVERYTHING CAN BE SUBSUMED UNDER BEING AND ESSENCE.
For this and other reasons, therefore, we must take good care to avoid assertion of a single genus; for it would be impossible to apply to everything the denominations of "being" and essence.[342] If indeed there be very different objects called essence, this is only accidentally, just as if one called the color white a being; for strictly we cannot apply "being" to white, as considered alone.[301] THE ONE IS SO FAR ABOVE ALL THE GENERA AS NOT TO BE COUNTED.
3. We therefore assert the existence of several genera, and that this plurality is not accidental. These divers genera, however, depend from the One. But even though they do depend from the One, if the One be not something which may be affirmed of each of them as considered in its being, then nothing hinders each of them, having nothing similar to the others, from constituting a genus apart. We also grant that the One, existing outside of the genera which are begotten of Him, is their cause, although the other essences considered in their being do not proclaim this. Yes indeed, the One is outside of the other essences.
Besides, He is above them; so much so, that He is not counted as one of them; for it is through Him that the other essences exist, which, so far as they are genera, are equal.
WE ARE DISCUSSING HERE NOT THE ABSOLUTE ONE, BUT THE ESSENTIAL RELATED ONE.
Still, it will be asked, Of what nature is the One which does not count among the genera? This (absolute One) is outside of our present consideration; for we are not studying Him who is above essence,[342] but the essences themselves. We must therefore pass by the absolute One, and seek the one which is counted among the genera.
THE RELATED ONE IS IN SOME GENERA, BUT NOT IN OTHERS.
To begin with (if we consider the related One from this point of view), it will seem astonishing to see the cause numbered along with the effects. It would indeed be unreasonable to cram into a single genus both superior and inferior things. If nevertheless, on counting the one amidst the essences of which He is the cause, He was to be considered as a genus to which the other essences were to be subordinated, and from which they differed; if, besides, the one was not to be predicated of the other essences either as genus, or in any other respect, it would still be necessary that the genera which possessed essence subsume species under them; since, for instance, by moving, you produce walking, and yet walking cannot be considered a genus subordinate to you; but above the walking there existed nothing else that could, in respect to it, operate as a genus; and if nevertheless there existed things beneath walking, walking would, in respect to them, be a genus of the essences.
THE PARTS OF A MANIFOLD UNITY ARE APART ONLY FOR EXAMINATION.
Perhaps, instead of saying that the one is the cause of the other things, we would have to admit that these things are as parts and elements of the one; and that all things form a single nature in which only our thought establishes divisions; so that, by virtue of its admirable power, this nature be unity distributed in all things, appearing and becoming manifold, as if it were in movement, and that the one should cease being unity as a result of the fruitfulness of its nature. If we were to enumerate successively the parts of such a nature, we would grant to each of them a separate existence, ignoring that we had not seen the whole together. But after thus having separated the parts, we would soon reapproximate them, not for long being able to keep apart the isolated elements which tend to reunite.
That is why we could not help making a whole out of them, letting them once more become unity, or rather, be unity. Besides, this will be easier to understand when we shall know what these essences are, and how many are the genera of essences; for we shall then be able to conceive their mode of existence. And as, in these matters, it is not well to limit oneself to negations, but to aim at positive knowledge, and at the full intelligence of the subject here treated, we shall have to make this inquiry.
THE GENERA OF ESSENCE WILL BE DETERMINED BY AN EXAMINATION OF THE PROBLEM OF THE ONE AND MANY.
4. If, on occupying ourselves with this sense-world, we wished to determine the nature of bodies, would we not begin by studying some part thereof, such as a stone? We could then distinguish therein substance, quantity--such as dimension--and quality, such as color; and after having discovered these same elements in other bodies, we could say that the elements of the corporeal nature are being, quantity, and quality; but that these three coexist; and that, though thought distinguish them, all three form but one and the same body.
If, besides, we were to recognize that movement is proper to this same organization, would we not add it to the three elements already distinguished? These four elements, however, would form but a single one, and the body, though one, would, in its nature, be the reunion of all four. We shall have to take the same course with our present subject, intelligible Being, and its genera and principles. Only, in this comparison, we shall have to make abstraction of all that is peculiar to bodies, such as generation, sense-perception, and extension. After having established this separation, and having thus distinguished essentially different things, we shall arrive at the conception of a certain intelligible existence, which possesses real essence, and unity in a still higher degree. From this standpoint, one might be surprised how the (substance which is thus) one can be both one and many. In respect to bodies, it is generally recognized that the same thing is both one and many; the body can indeed be divided infinitely; color and appearance, for instance, are therein very differing properties, since they are separated here below. But in respect to the soul, if she be conceived as one, without extent, dimension and absolutely simple, as it appears at first sight, how could we, after that, believe that the soul were manifold? We should have here expected to reach unity, all the more as, after having divided the animal in body and soul, and after having demonstrated that the body is multiform, composite and diverse, one might well, on the contrary, have expected to find the soul simple; and to have accepted this conclusion as final, as the end of our researches. We would thus have taken the soul as a sample of the intelligible world, just as the body represents the sense-world. Having thus considered this soul, let us examine how this unity can be manifold; how, in its turn, the manifold can be unity; not indeed a composite formed of separable parts, but a single nature simultaneously one and manifold. For, as we have already said, it is only by starting from this point and demonstrating it, that we will establish solidly the truth about the genera of essence.
THE SOUL IS A PLURAL UNITY OF SEMINAL REASONS.
5. The first consideration that meets us is that each body, whether of animals or plants, is multiple, by virtue of its colors, forms, dimensions, the kinds of parts, and diversity of their position; and that nevertheless all things derive from unity, whether from the absolutely simple Unity, or from the habituation of the universal Unity, or from some principle having more unity--and consequently more essence--than the things it produces; because, the further the distance from unity, the less the essence. The principle which forms the bodies must therefore be one, without either being absolutely one, nor identical with the One; otherwise, it would not produce a plurality that was distant from unity; consequently, it must be a plural-unity. Now this principle is the soul; therefore she must be a plural unity. This plurality, however, consists of the ("seminal) reasons" which proceed from the soul. The reasons, indeed, are not other than the soul; for the soul herself is reason, being the principle of the reasons; the reasons are the actualization of the soul which acts according to her being; and this being is potentiality of the reasons.[303] The soul is therefore plurality simultaneously with unity; which is clearly demonstrated by the action she exerts on other things.
THE SOUL IS A DEFINITE ESSENCE AS PARTICULAR BEING.
But what is the soul considered apart from all action, if we examine in her the part which does not work at formation of the bodies?[304] Will not a plurality of powers still be found therein? As to world-Essence, nobody even thinks of depriving the soul of it. But is her acknowledged essence the same as that predicated of a stone? Surely not. Besides, even in the essence of the stone, "being" and "being a stone" are inseparable concepts, just as "being" and "being a soul" are, in the soul, but one and the same thing.[305] Must we then regard as different in her essence on one side, and on the other the remainder (what constitutes the being); so that it would be the difference (proper to being) which, by being added to her, constituted the soul? No: the soul is no doubt a determinate essence; not as a "white man," but only as a particular being; in other words, she has what she has by her very being.
THE ESSENCE OF THE SOUL DERIVES FROM ITS BEING; ADDING LIFE TO ESSENCE.
6. However, could we not say that the soul does not have all that she has through her being, in this sense, that in her we must distinguish on one hand essence, and on the other some kind of essence? If the soul possess such a kind of essence, and if this kind of essence come to her from without, the whole will no longer be the being of the soul so far as she is soul; only partially will it be the being of the soul, and not in totality. Besides, what would be the essence of the soul without the other things which constitute her being? Will the essence be the same for the soul as for the stone? Will we not rather have to insist that this essence of the soul derives from her very being; that this essence is her source and principle; or rather, that it is all that the soul is, and consequently is life; and finally that in the soul life and essence fuse?
SOUL UNITY DOES NOT RESEMBLE THE UNITY OF A REASON, INCLUDING PLURALITY.
Shall we say that this unity resembles that of a "reason" (of a form)? No. The substance of the soul is one; but such unity does not exclude duality or even plurality; for it admits of all the attributes essential to the soul.
THE SOUL IS BOTH BEING AND LIFE.
Should we say that the soul is both being and life, or that she possesses life? To say that the soul possesses life would mean that the possessor is not inherently alive, or that life does not inhere in her "being." If then we cannot say that one of the two possesses the other, we shall have to recognize that both are identical, or that the soul is both one and manifold, in her unity embracing all that appears in her; that in herself she is one, but manifold in respect to other things; that, although she be one by herself, she makes herself multiple by her movement; that, while forming a whole which is one, she seeks to consider herself in her multiplicity. So Essence also does not remain unitary, because its potentiality extends to all it has become. It is contemplation that makes it appear manifold, the necessary thought has multiplied it. If it appear as one only, it is only because it has not yet thought, and it really is still only one.
THE FIRST TWO GENERA ARE BEING AND MOVEMENT.
7. What and how much can be seen in the soul? Since we have found in the soul both being and life, and as both being and life are what is common in every soul, and as life resides in intelligence, recognizing that there is (besides the soul and her being) intelligence and its life, we shall posit as a genus what is common in all life; namely, movement; consequently, being and movement, which constitute primary life, will be our first two categories. Although (in reality) they fuse, they are distinguished by thought, which is incapable of approaching unity exclusively; and whose exercise compels this distinction. Besides, it is possible, you can, in other objects, clearly see essence, as distinct from movement or life, although their essence be not real, and only shadowy or figurative.[306] Just as the image of a man lacks several things, and, among others, the most important, life; likewise, the essence of sense-objects is only an adumbration of the veritable essence, lacking as it does the highest degree of essence, namely, vitality, which appears in its archetype.
So you see it is quite easy to distinguish, on one hand, essence from life, and, on the other, life from essence. Essence is a genus, and contains several species; now movement must not be subsumed under essence, nor be posited within essence, but should be equated with essence. When we locate movement within essence, it is not that we consider life is the subject of movement, but because movement is life's actualization; only in thought can either exist separately.
These two natures, therefore, form but a single one; for essence exists not in potentiality, but in actualization; and if we conceive of these two genera as separated from each other it will still be seen that movement is within essence, and essence within movement. In the unity of essence, the two elements, when considered separately, imply each other reciprocally; but thought affirms their duality, and shows that each of the two series is a double unity.
ANOTHER GENUS IS STABILITY, WHICH IS ONLY ANOTHER KIND OF MOVEMENT.
Since then it is in the sphere of essence that movement appears, and since movement manifests its perfection far rather than it divides its being; and since essence, in order to carry out the nature here assigned to it, must always persevere in movement, it would be still more absurd to deny it stability, than to refuse it movement. The notion and the conception of stability are still more in harmony with the nature of essence than are those of movement; for it is in essence that may be found what is called "remaining in the same state," "existing in the same manner," and "being uniform." Let us therefore assert that stability is a genus different from movement, of which it seems to be the opposite.
DISTINCTION BETWEEN STABILITY AND ESSENCE.
In many ways it can be shown that stability must be kept apart from essence. In the first place, if stability were identical with essence, why should it be so, rather than movement, which is life, the actualization of being, and of essence itself? Since we have distinguished between movement and essence, and since we have said that it is both identical therewith, and still at the same time different from it; and because essence and movement are different from each other from one viewpoint, but from another, are identical; we must also (in thought) distinguish stability from essence without separating it (in existence); and by separating it in thought, we shall be making a distinct genus of it. Indeed, if stability and essence were to be confused together in a perfect union, if we were to acknowledge no difference between them, we would still be obliged to identify stability with movement by the intermediation of essence; in this way stability and movement would together form but one and the same thing.[307] ESSENCE, STABILITY AND MOVEMENT EXIST BECAUSE THOUGHT BY INTELLIGENCE.
8. We must posit these three genera (essence, movement, and stability) because intelligence thinks each of them separately. By thinking them simultaneously, Intelligence posits them; and, as soon as Intelligence thinks them, they are (in existence). The things whose existence ("essence") implies matter do not exist in Intelligence; for otherwise they would be immaterial. On the contrary, immaterial things come into existence by merely being thought. So then contemplate pure Intelligence, instead of seeking it with your bodily eyes, fix on it your interior gaze. Then will you see the hearth of "Being," where shines an unsleeping light; you will see therein how essences subsist as simultaneously divided and united; you will see in it an abiding life, the thought which applies not to the future, but to the present; which possesses it already, and possesses it for ever; which thinks what is intimate to it, and not what is foreign. Intelligence thinks: and you have actualization and movement. Intelligence thinks what is in itself: and you have "being" and essence; for, by merely existing, Intelligence thinks: Intelligence thinks itself as existing, and the object to which Intelligence applies its thought exists also.
The actualization of Intelligence on itself is not "being"; but the object to which it refers, the Principle from which it derives, is essence. Essence, indeed, is the object of intuition, but not intuition itself; the latter exists (has "essence") only because it starts from, and returns thereto. Now as essence is an actualization, and not a potentiality, it unites both terms (existence and intuition, object and subject), and, without separating them, it makes of intuition essence, and of essence intuition. Essence is the unshakable foundation of all things, and support of their existence; it derives its possessions from no foreign source, holding them from itself, and within itself. It is simultaneously the goal of thought, because it is stability that never needed a beginning, and the principle from which thought was born, because it is unborn stability; for movement can neither originate from, nor tend towards movement. The idea also belongs to the genus of stability, because it is the goal (or limit) of intelligence; but the intellectual actualization by which it is thought constitutes movement.
Thus all these things form but one thing; and movement, stability, and the things which exist in all essences constitute genera (or classifications). Moreover, every essence posterior to these genera is, in its turn, also definite essence, definite stability, and definite movement.
THIS TRIUNE PLAY IMPLIES ALSO IDENTITY AND DIFFERENCE.
Summing up what we have discovered about the nature of Essence, we find first three genera. Then, these three, Essence, Movement and Stability were contemplated respectively by the essence, movement and stability within ourselves, which we also harmonized with those intelligibles.
Then again we lost the power of distinguishing them by uniting, confusing, and blending these three genera. But a little later we divided, extricated and distinguished them so as again to see essence, movement and stability; three things, of which each exists apart. The result of this process then is that they are regarded as different, discerning them by their differences, and recognizing difference in essence by positing three things each of which exists apart. On the other hand, if they be considered in their relation with unity and in unity, if they be all reduced to being something single and identical, one may see the arising, or rather the existing of identity. To the three genera already recognized, therefore, we shall have to add identity or difference, or (in Platonic language[308]), "sameness and other-ness." These two classifications added to the three others, will in all make five genera for all things. Identity and difference (are genuine genera, indeed, because they) also communicate their characteristics to inferior (beings), each of which manifests some such element.
THESE FIVE GENERA ARE PRIMARY BECAUSE NOTHING CAN BE AFFIRMED OF THEM.
These five genera that we thus recognize are primary, because nothing can be predicated of them in the category of existence (being). No doubt, because they are essences, essence might be predicated of them; but essence would not be predicated of them because "being" is not a particular essence. Neither is essence to be predicated of movement or stability, for these are species of essence. Neither does essence participate in these four genera as if they were superior genera under which essence itself would be subsumed; for stability, movement, identity and difference do not protrude beyond the sphere of essence, and are not anterior thereto.
WHY NOT ADD OTHERS SUCH AS UNITY, QUANTITY, QUALITY, OR RELATION?
9. These and similar (Platonic) arguments demonstrate that those are genuinely primary genera; but how are we to prove they are exclusive?
Why, for example, should not unity, quantity, quality, relation, and further (Aristotelian) categories, be added thereto?
NEITHER ABSOLUTE NOR RELATIVE UNITY CAN BE A CATEGORY.
Unity (may mean two things). The absolute Unity, to which nothing may be added, neither Soul, nor Intelligence, nor anything else, cannot be predicated as attribute of anything, and therefore cannot be a genus.
But if we are referring to the unity which we attribute to essence, when we say that essence is one, it is no longer the original Unity.
Besides, how could the absolute One, which within itself admits of no difference, beget species? If it cannot do this, it cannot be a genus.
How indeed could you divide unity? By dividing it, you would multiply it; and thus Unity-in-itself would be manifold, and in aspiring to become a genus it would annihilate itself. Besides, in order to divide this unity into species, you would have to add something to unity, because it does not contain differences such as exist in being.
Intelligence might well admit differences between essences, but this could not possibly be the case with unity. The moment you add a single difference, you posit duality, and consequently destroy unity; for everywhere the addition of a single unity causes any previously posited number to disappear.
UNITY IS NOT SYNONYMOUS WITH ESSENCE.
It may be objected that the unity which is in essence, in movement, and the remainder of the genera, is common to all of them, and that one might therefore identify unity with essence.[309] It must then be answered that, just as essence was not made a genus of other things because they were not what was essence, but that they were called essences in another sense, here likewise unity could not be a common attribute of other things, because there must be a primary Unity, and a unity taken in a secondary sense. If, on the other hand, it be said that unity should not be made a genus of all things, but something which exists in itself like the others, if afterwards unity be identified with essence, then, as essence has already been listed as one of the genera, we would be merely uselessly introducing a superfluous name.[310] Distinguishing between unity and essence is an avowal that each has its separate nature; the addition of "something" to "one" makes a "certain one"; addition of nothing, on the other hand, allows unity to remain absolute, which cannot be predicated of anything. But why could this unity not be the First Unity, ignoring the absolute Unity? For we use "first Unity" as a designation of the essence which is beneath the "absolute Unity." Because the Principle anterior to the first Essence (that is, the first and absolute Unity) is not essence; otherwise, the essence below Him would no longer be the first Essence; here, on the contrary, the unity which is above this unity is the absolute Unity. Besides, this unity which would be separated from essence only in thought, would not admit of any differences.
Besides, there are three alternatives. Either this unity alleged to inhere in essence will be, just like all other essences, a consequence of the existence of essence; and consequently, would be posterior to it. Or, it will be contemporaneous with essence and the other (categories); but a genus cannot be contemporaneous with the things of which it is the genus. The third possibility is that it may be anterior to essence; in which case its relation to Essence will be that of a principle, and no longer a genus containing it. If then unity be not a genus in respect to essence, neither can it be a genus in respect of other things; otherwise, we would have to say of essence also that it was a genus embracing everything else.
ESSENCE CANNOT BECOME A GENUS SO LONG AS IT REMAINS ONE.
Considering unity according to its essence, it seems to fuse and coincide with absolute Essence, for essence, so far as it trends towards unity, is a single essence; but in so far as it is posterior to unity, it becomes all things it can be, and becomes manifold. Now, so far as essence remains one and does not divide, it could not constitute a genus.
ELEMENTS OF ESSENCE CAN BE SAID TO BE ONE ONLY FIGURATIVELY.
10. In what sense, therefore, could each of the elements of essence be called "one"? In that it is something unitary, without being unity itself; for what is a "certain one" is already manifold. No species is "one" except figuratively[306]; for in itself it is manifold. It is in the same sense that, in this sense-world, we say that an army, or a choric ballet, constitute a unity. Not in such things is absolute unity; and therefore it may not be said that unity is something common.
Neither does unity reside in essence itself, nor in the individual essences; therefore, it is not a genus. When a genus is predicated of something, it is impossible to predicate of the same thing contrary properties; but of each of the elements of universal essence it is possible to assert both unity and its opposite. Consequently (if we have called unity a genus), after having predicated of some essence unity as a genus, we would have affirmed, of the same essence, that unity was not a genus. Unity, therefore, could not be considered one of the primary genera; for essence is no more one than it is manifold.
As to the other genera, none of them is one without being manifold; much less could unity be predicated of the secondary genera of which each is quite manifold. Besides, no genus, considered in its totality, is unitary; so that if unity were a genus, it would merely thereby cease being unity; for unity is not a number, and nevertheless it would become a number in becoming a genus. Of course, numbers include an alleged unity, as soon as we try to erect it into a genus, it is no longer a unity, in a strict sense. Among numbers unity is not applied to them as would have been a genus; of such unity it is merely said that it is among numbers, not that it is a genus; likewise, if unity were among the essences, it would not be there as genus of essence, nor of anything else, nor of all things. Again, just as the simple is the principle of the composite without being considered a genus in respect to it--then it would be simultaneously simple and composite--so, if one were considered to be a principle, it could not be a genus in respect to things subsumed under it; and therefore will be a genus neither for essence, nor for other (categories or things).
VARIOUS ARGUMENTS AGAINST UNITY AS A CATEGORY.
If unity were to be considered a genus, it could be that only in respect to the things of which each is said to be one;[309] as if, for instance, one should, from "being," deduce the unity contained within it. Unity would then be the genus of certain things; for just as essence is a genus, not in respect to all things, but in respect to those species that possess essence, so unity would be a genus in respect to the species that possess unity. This, however, is impossible; for things do not differ in respect to unity, as they do in respect to essence.
It might further be objected that if the same divisions which were applied to essence were applied to unity, and if essence be a genus because it divides itself, and manifests itself as the same in a number of things, why then should unity also not be a genus, since it appears in as many things as essence, and similarly divides itself?
Mere recurrence of something in several essences is no proof it is a genus; whether in respect to the essences in which it occurs, or to others. Merely being common to several essences by no means constitutes a genus. No one will claim that a point is a genus for lines or for anything else, though points be found in all lines. As said, unity is found in every number, and nevertheless it is not a genus for