SIXTH ENNEAD, BOOK ONE.
Of the Ten Aristotelian and Four Stoic Categories
HISTORICAL REVIEW OF CATEGORIES.
1. Very ancient philosophers have investigated the number and kinds of essences. Some said there was but one; others, that there was a limited number of them; others still, an infinite number. Besides, those who recognized but a single (essence) have advanced opinions very different, as is also the case with those who recognized a limited or unlimited number of essences. As the opinions of these philosophers have been sufficiently examined by their successors, we shall not busy ourselves therewith. We shall study the doctrine of those who, after having examined the opinions of their predecessors, decided on determinate numbers (of essences); admitting neither a single essence, because they recognized that there was a multiplicity even in the intelligibles; nor an infinite number of essences, because such an infinity could not exist, and would render all science impossible; but who, classifying the essences whose number is limited, and seeing that these classifications could not be considered elements, looked on them as “kinds.” Of these, some (the Peripatetic Aristotelians) proposed ten, while others proposed a lesser number (the Stoics taught four), or a greater number (the Pythagorean “oppositions,” for instance). As to the kinds, there is also difference of opinions: some looked upon the kinds as principle (Plotinos himself); while others (Aristotle) held that they formed classes.
STATEMENT OF ARISTOTLE’S POSITION.
Let us first examine the doctrine that classifies essence into ten (kinds). We shall have to investigate whether it be necessary to acknowledge that its partisans recognize ten kinds, all of which bear the name of essence, or ten categories ; for they say that essence is not synonymous in everything, and they are right.
ARISTOTLE’S CATEGORIES NEGLECT THE INTELLIGIBLE WORLD.
Let us begin by asking these philosophers whether the ten kinds apply equally to sense-(essences), and intelligible (essences), or whether they all apply to the sense-(essences), and some only to the intelligible (essences) ; for here there are no longer mutual relations. We must therefore inquire which of those ten kinds apply to intelligible essences, and see whether intelligible essences can be reduced to one single kind, that would also apply to sense-essences; and whether the word “being” can be applied simultaneously to intelligible and sense-entities, as a “homonymous” label. For if “being” be a homonym, there are several different kinds. If, however, it be a synonym (or, name of common qualities) it would be absurd that this word should bear the same meaning in the essences which possess the highest degree of existence, and in those which possess its lower degree; for the things among which it is possible to distinguish both primary and lower degrees could not belong to a common kind. But these (Aristotelian) philosophers do not, in their division, regard the (Platonic) intelligible entities. They therefore did not mean to classify all beings; they passed by those that possess the highest degree of existence.