Is the expression of the essence of something simultaneously the expression of its unity, so that it possesses as much unity as it possesses essence? Or does this simultaneousness exist without any direct proportion between the amount of unity and essence? Yes; for it is possible that something have less unity without, on that account, having any the less essence; an army, a choric ballet have not less essence than a house, though far less unity. The unity present in each thing seems therefore to aspire to the Good, which has the most unity;[311] for the closer something approaches the Good, the greater unity does it achieve; that is the criterion of greater or less unity. Indeed, every (being) desires not only merely to be (alive), but to enjoy the Good. That is why everything, so far as it can, hastens to become one, and those (beings) which by nature possess unity naturally trend towards Him by desiring to unite with themselves. For every (being) hastens not to separate from others, but on the contrary their tendency is to tend towards each other and themselves. That is why all souls, while preserving their individual nature, would like to fuse into a single soul. The One reigns everywhere in the sense-world, as well as in the Intelligible. It is from Him that everything originates, it is towards Him that everything trends. In Him do all (beings) seek their principle and their goal; for only therein do they find their good; only by that does each (being) subsist, and occupies its place in the universe; once that it exists, no (being) could help trending towards the One. This occurs not only in nature, but even in the arts; where each art seeks, to the extent of its ability, to conform its works to unity, to the extent of its ability, and to the possibilities of its works. But that which succeeds best, is Essence itself, which is quite close to unity.
FURTHER REASONS WHY UNITY IS NOT A CATEGORY.
Consequently, in speaking of (beings) other than (essence itself), as, for instance, of man, we say simply "man" (without adding to it the idea of unity[312]); if however we say "a man," it is to distinguish him from two; if however we use the word one in still another sense, it is by adding to it "some" (as, "someone"). Not so is it with essence; we say, "being one," conceiving of "being" ("essence") and one, as if forming a single whole, and in positing essence as one, we emphasize its narrow affinity with the Good. Thus conceived, essence becomes one;[313] and in the one finds its origin and goal. Nevertheless it is not one as unity itself, but rather in a different manner, in this sense that the (unity of essence) admits priority and posteriority. What then is (the unity of essence)? Must it not then be considered similar in all the parts (of essence), as something common to all (and consequently, as forming a genus)? But in the first place, the point is also something common to all the lines, and nevertheless it is not a genus; in the numbers, unity is something common to all, and is not any more of a genus. Indeed, the unity which is found in the monad, in the dyad (or pair), and in other numbers, cannot be confused with unity in itself. Then, nothing hinders there being in essence some anterior, and other posterior parts, both simple and compound ones (which would be impossible for the One in itself). Even if the unity found everywhere in all the parts of essence were everywhere identical, by the mere fact that it would offer no difference, it could not give rise to species, and consequently, it could not be a genus.
BY TENDING TOWARDS THE ONE, EVERYTHING TENDS TOWARDS THE GOOD.
12. We therefore assert (that by moving towards unity everything moves towards the Good). How can it be, however, that Goodness should consist in coming closer to unity, even for number, which is inanimate?[314] This question might as well be asked about any inanimate object whatever. If we were told that such (beings) do not enjoy (existence), we might answer that we are here treating of beings according to their proximity to unity only. If, for instance, we were asked how a point can participate in the Good, we might answer by a retort, asking whether we are dealing with the Point in itself. Then we would answer by the observation that the state of affairs was the same for all things of the same kind. If however we were pressed about the point considered as existing in some object, as, for instance, in the circle, we would answer that for such a point, the Good is the good of the circle (of which it forms part); that such is the Good towards which it aspires, and that it seeks that as far as possible through the intermediation of the circle.
THESE GENERA EXIST IN BOTH THE SUBORDINATE OBJECTS, AND THEMSELVES.
But how could we realize such genera? Are all these genera susceptible of division, or do they lie entire within each of the objects they comprehend? If so, how does this unity find itself? Unity exists therein as a genus, just as the whole exists within the plurality.
Does unity exist only in the objects that participate therein? Not only in these objects, but also in itself. This point will be studied later.
QUANTITY IS A SECONDARY GENUS, THEREFORE NOT A FIRST.
13. Now why should we not posit quantity among the primary genera? And why not also quality? Quantity is not one of the primary genera like those we have posited, because the primary genera coexist with essence (which is not the case with quantity). Indeed, movement is inseparable from essence; being its actualization and life. Stability is implied in being; while identity and difference are still more inseparable from essence; so that all these (categories) appear to us simultaneously. As to number (which is discrete quantity), it is something posterior. As to (mathematical) numbers, far more are they posterior both to these genera, and themselves; for the numbers follow each other; the second depends on the first, and so forth; the last are contained within the first. Number, therefore, cannot be posited among the primary genera. Indeed, it is permissible to doubt whether quantity may be posited as any kind of a genus. More even than number, extension (which is continuous quantity), shows the characteristics of compositeness, and of posteriority. Along with number, the line enters into the idea of extension. This would make two elements. Then comes surface, which makes three. If then it be from number that continuous dimension derives its quantitativeness, how could this dimension be a genus, when number is not? On the other hand, anteriority and posteriority exist in dimension as well as in numbers. But if both kinds of quantities have in common this, that they are quantities, it will be necessary to discover the nature of quantity. When this will have been found, we shall be able to make of it a secondary genus; but it could not rank with the primary genera. If, then, quantity be a genus without being a primary one, it will still remain for us to discover to which higher genus, whether primary or secondary, it should be subsumed.