As I said then, they differ in kind, and you cannot at any time you choose find a Movement complete in its whole nature, but, if at all, in the whole time requisite.
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.”223