Enneads VI.3: Plotino's Own Sense-Categories
Physical Being Is That Which Is Not in a Subject
Not to be in a subject is then the common characteristic of all “being,” if, by “not being in a subject,” we mean “not to form part of any subject,” and “not to contribute to the formation of a unity therewith.” Indeed, that which contributes to the formation of a composite being, with something else, could not be in that thing as in a subject; form therefore is not in matter as in a subject, and neither is “man” in Socrates as in a subject, because “man” forms part of Socrates. Thus, “being” is that which is not in a subject. If we add that “being” is not predicated of any subject, we must also add, “insofar as this subject is something different from itself;” otherwise “man,” predicated of some one man, would not be comprised within the definition of “being,” if (in asserting that “being” is not predicated of any subject), we did not add, “so far as this subject is something different from itself.” When I say, “Socrates is a man,” I am practically saying, “White is white,” and not, “wood is white.” While actually asserting that “Socrates is a man,” I am asserting that a particular man is a man, and to say “The man who is in Socrates is a man,” amounts to saying “Socrates is Socrates,” or, “that particular reasonable living organism is a living organism.”
ALL THE OTHER PHYSICAL CATEGORIES REFER TO MATTER, FORM OR COMBINATION.
It might however be objected that the property of “being” does not consist in being a subject; for the difference (as, for instance, a biped), is also one of those things which are not in a subject. If “biped” be considered as a part of being, we are compelled to recognize that “biped” is not in a subject; but if by “biped” we do not mean some particular “being” but the property of being a biped, then we are no longer speaking of a being, but of a quality, and “biped” will be in a subject.
But time and place do not seem to be in a subject! If we define time as “the measure of movement,” (there are two possibilities). First, time might be measured movement; and then it will be in movement as in a subject, while movement itself will be in the moved thing. Or, time will be what measures (the soul, or the present moment), and then it will be in what measures as in a subject. As to space, as it is the limit of what contains, it will also reside in what contains. It is otherwise with the “being” that we are here considering. “Being,” then, will have to be considered as consisting in either one, or in several, or in all the properties of which we are speaking; because these properties simultaneously suit matter, form, and the combination.