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And so it is with the Movement of walking and all others: for, if motion be a Movement from one place to another place, then of it too there are different kinds, flying, walking, leaping, and such-like. And not only so, but there are different kinds even in walking: the where-from and where-to are not the same in the whole Course as in a portion of it; nor in one portion as in another; nor is crossing this line the same as crossing that: because a man is not merely crossing a line but a line in a given place, and this is in a different place from that.

Of Movement I have discoursed exactly in another treatise. I will now therefore only say that it seems not to be complete at any given moment; and that most movements are incomplete and specifically different, since the whence and whither constitute different species.

But of Pleasure the whole nature is complete at any given moment: it is plain then that Pleasure and Movement must be different from one another, and that Pleasure belongs to the class of things whole and complete. And this might appear also from the impossibility of moving except in a definite time, whereas there is none with respect to the sensation of Pleasure, for what exists at the very present moment is a kind of “whole.”

From these considerations then it is plain that people are not warranted in saying that Pleasure is a Movement or a Generation: because these terms are not applicable to all things, only to such as are divisible and not “wholes:” I mean that of an act of Sight there is no Generation, nor is there of a point, nor of a monad, nor is any one of these a Movement or a Generation: neither then of Pleasure is there Movement or Generation, because it is, as one may say, “a whole.”

Now since every Percipient Faculty works upon the Object answering to it, and perfectly the Faculty in a good state upon the most excellent of the Objects within its range (for Perfect Working is thought to be much what I have described; and we will not raise any question about saying “the Faculty” works, instead of, “that subject wherein the Faculty resides”), in each case the best Working is that of the Faculty in its best state upon the best of the Objects answering to it. And this will be, further, most perfect and most pleasant: for Pleasure is attendant upon every Percipient Faculty, and in like manner on every intellectual operation and speculation; and that is most pleasant which is most perfect, and that most perfect which is the Working of the best Faculty upon the most excellent of the Objects within its range.

And Pleasure perfects the Working. But Pleasure does not perfect it in the same way as the Faculty and Object of Perception do, being good; just as health and the physician are not in similar senses causes of a healthy state.

And that Pleasure does arise upon the exercise of every Percipient Faculty is evident, for we commonly say that sights and sounds are pleasant; it is plain also that this is especially the case when the Faculty is most excellent and works upon a similar Object: and when both the Object and Faculty of Perception are such, Pleasure will always exist, supposing of course an agent and a patient.

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Furthermore, Pleasure perfects the act of Working not in the way of an inherent state but as a supervening finish, such as is bloom in people at their prime. Therefore so long as the Object of intellectual or sensitive Perception is such as it should be and also the Faculty which discerns or realises the Object, there will be Pleasure in the Working: because when that which has the capacity of being acted on and that which is apt to act are alike and similarly related, the same result follows naturally.

How is it then that no one feels Pleasure continuously? is it not that he wearies, because all human faculties are incapable of unintermitting exertion; and so, of course, Pleasure does not arise either, because that follows upon the act of Working. But there are some things which please when new, but afterwards not in the like way, for exactly the same reason: that at first the mind is roused and works on these Objects with its powers at full tension; just as they who are gazing stedfastly at anything; but afterwards the act of Working is not of the kind it was at first, but careless, and so the Pleasure too is dulled.

Again, a person may conclude that all men grasp at Pleasure, because all aim likewise at Life and Life is an act of Working, and every man works at and with those things which also he best likes; the musical man, for instance, works with his hearing at music; the studious man with his intellect at speculative questions, and so forth. And Pleasure perfects the acts of Working, and so Life after which men grasp. No wonder then that they aim also at Pleasure, because to each it perfects Life, which is itself choiceworthy. (We will take leave to omit the question whether we choose Life for Pleasure’s sake of Pleasure for Life’s sake; because these two plainly are closely connected and admit not of separation; since Pleasure comes not into being without Working, and again, every Working Pleasure perfects.)

And this is one reason why Pleasures are thought to differ in kind, because we suppose that things which differ in kind must be perfected by things so differing: it plainly being the case with the productions of Nature and Art; as animals, and trees, and pictures, and statues, and houses, and furniture; and so we suppose that in like manner acts of Working which are different in kind are perfected by things differing in kind. Now Intellectual Workings differ specifically from those of the Senses, and these last from one another; therefore so do the Pleasures which perfect them.

This may be shown also from the intimate connection subsisting between each Pleasure and the Working which it perfects: I mean, that the Pleasure proper to any Working increases that Working; for they who work with Pleasure sift all things more closely and carry them out to a greater degree of nicety; for instance, those men become geometricians who take Pleasure in geometry, and they apprehend particular points more completely: in like manner men who are fond of music, or architecture, or anything else, improve each on his own pursuit, because they feel Pleasure in them. Thus the Pleasures aid in increasing the Workings, and things which do so aid are proper and peculiar: but the things which are proper and peculiar to others specifically different are themselves also specifically different.

Yet even more clearly may this be shown from the fact that the Pleasures arising from one kind of Workings hinder other Workings; for instance, people who are fond of flute-music cannot keep their attention to conversation or discourse when they catch the sound of a flute; because they take more Pleasure in flute-playing than in the Working they are at the time engaged on; in other words, the Pleasure attendant on flute-playing destroys the Working of conversation or discourse. Much the same kind of thing takes place in other cases, when a person is engaged in two different Workings at the same time: that is, the pleasanter of the two keeps pushing out the other, and, if the disparity in pleasantness be great, then more and more till a man even ceases altogether to work at the other.