The next section of the Metaphysics, from Book 7, Chapter 4 through Book 9, is the beginning of an intense forward motion. These books are a painstaking clarification of the being of the things disclosed to our senses. It is here that Aristotle most heavily uses the vocabulary that is most his own, and everything he accomplishes in these books depends on the self-evidence of the meanings of these expressions. It is these books especially which Latinizing translators turn into gibberish. Words like essence, individual, and actuality must either be vague or be given arbitrary definitions. The words Aristotle uses are neither vague nor are they conceptual constructions; they call forth immediate, direct experiences which one must have at hand to see what Aristotle is talking about. They are not the kinds of words that books can explain; they are words of the kind that people must share before there can be books. That is why understanding a sentence of Aristotle is so often something that comes suddenly, in an insight that seems discontinuous from the puzzlement that preceded it. It is simply a matter of directing one's gaze. We must try to make sense of Books 7-9 because they are crucial to the intention of the Metaphysics. Aristotle has an argument independent of those books, which he makes in Book 8 of the Physics and uses again in Book 12 of the Metaphysics that there must be an immortal, unchanging being, ultimately responsible for all wholeness and orderliness in the sensible world. And he is able to go on in Book 12 to discover a good deal about that being. One could, then, skip from the third chapter of Book 7 to Book 12, and, having traced being to form, trace form back to its source. Aristotle would have done that if his whole intention had been to establish that the sensible world has a divine source, but had he done so he would have left no foundation for reversing the dialectical motion of his argument to understand the things in the world on the basis of their sources. Books 7-9 provide that foundation.

The constituents of the world we encounter with our senses are not sensations. The sensible world is not a mosaic of sensible qualities continuous with or adjacent to one another, but meets our gaze organized into things which stand apart, detached from their surroundings. I can indicate one of them to you by the mere act of pointing, because it has its own boundaries and holds them through time. I need not trace out the limits of the region of the visual field to which I refer your attention, because the thing thrusts itself out from, holds itself aloof from what is visible around it, making that visible residue mere background. My pointing therefore has an object, and it is an object because it keeps being itself, does not change randomly or promiscuously like Proteus, but holds together sufficiently to remain the very thing at which I pointed. This way of being, Aristotle calls being a "this". If I want to point out to you just this red of just this region of this shirt, I will have to do a good deal more than just point. .A "this" as Aristotle speaks of it is what comes forth to meet the act of pointing, is that for which Г need not point and say "not that or that or that but just this," but need do nothing but point, since it effects its own separation from what it is not.

A table, a chair, a rock, a painting--each is a this, but a living thing is a this in a special way. It is the author of its own this-ness. It appropriates from its surroundings, by eating and drinking and breathing, what it organizes into and holds together as itself. This work of self-separation from its environment is never finished but must go on without break if the living thing is to be at all. Let us consider as an example of a living this, some one human being. Today his skin is redder than usual, because he has been in the sun; there is a cut healing on his hand because he chopped onions two days ago; he is well educated, because, five years ago, his parents had the money and taste to send him to Harvard. All these details, and innumerably many more, belong to this human being. But in Aristotle's way of speaking, the details I have named are incidental to him: he is not sunburned, wounded on the hand, or Harvard-educated because he is a human being. He is each of those things because his nature bumped into that of something else and left him with some mark, more or less intended, more or less temporary, but in any case aside from what he is on his own, self-sufficiently. What he is on his own, as a result of the activity that makes him be at all, is: two-legged, sentient, breathing, and all the other things he is simply as a human being. There is a difference between all the things he happens to be and the things he necessarily is on account of what he is. Aristotle formulates the latter, the kind of being that belongs to a thing not by happenstance but inevitably, as the "what it kept on being in the course of being at all" for a human being, or a duck, or a rosebush. The phrase to en einai is Aristotle's answer to the Socratic question, ti esti? What is a giraffe? Find some way of articulating all the things that every giraffe always is, and you will have defined the giraffe. What each of them is throughout its life, is the product at any instant for any one of them, of the activity that is causing it to be. That means that the answer to the question "What is a giraffe?", and the answer to the question "What is this giraffe?" are the same. Stated generally, Aristotle's claim is that a this, which is in the world on its own, self-sufficiently, has a what-it-always-was-to-be, and is just its what-it-always-was-to-be. This is not a commonplace thought, but it is a comprehensible one; compare it with the translators' version, "a per-se individual is identical with its essence."