CHAPTER XVII.

PLEASURABLE AND PAINFUL SENSATIONS.

THERE is a remarkable difference of sensations, which has been mentioned before, but which must now be more particularly attended to.

Some sensations, probably the greater number, are what we call indifferent. They are not considered as either painful, or pleasurable. There are sensations, however, and of frequent recurrence, some of which are painful, some pleasurable. The difference is, that which is felt. A man knows it, by feeling it; and this is the whole account of the phenomenon. I have one sensation, and then another, and then another. The first is of such a kind, that I care not whether it is long or short; the second is of such a kind that I would put an end to it instantly if I could; the third is of such a kind, that I like it prolonged. To distinguish those feelings, I give them names. I call the first Indifferent; the second, Painful; the third. Pleasurable; very often, for shortness, I call the second, Pain, the third, Pleasure.

We formerly shewed, that having a sensation and 185 knowing it, are not two things, but one and the same thing; that having two sensations and knowing them, are not two things, but one and the same thing. It is obvious, therefore, that having three sensations, an Indifferent, a Pleasurable, and a Painful, and knowing them for what they are, are not different things, but one and the same thing.

The pleasurable and painful sensations are common to all the senses. We have pleasures and pains of the eye, of the ear, of the touch, the taste, the smell, and also of many internal parts of the body, for which, though, as we shall presently see, they hold a great share in composing the springs of human action, we have not names, nor any means of accurate estimation.36

36 In the case of many pleasurable or painful sensations, it is open to question whether the pleasure or pain, especially the pleasure, is not something added to the sensation, and capable of being detached from it, rather than merely a particular aspect or quality of the sensation. It is often observable that a sensation is much less pleasurable at one time than at another, though to our consciousness it appears exactly the same sensation in all except the pleasure. This is emphatically the fact in cases of satiety, or of loss of taste for a sensation by loss of novelty. It is probable that in such cases the pleasure may depend on different nerves, or on a different action of the same nerves, from the remaining part of the sensation. However this may be, the pleasure or pain attending a sensation is (like the feelings of Likeness, Succession, &c.) capable of being mentally abstracted from the sensation, or, in other words, capable of being attended to by itself. And in any case Mr. Bain’s distinction holds good, between the emotional part or property of a sensation (in which he includes the 186 pleasure or pain belonging to it) and its intellectual or knowledge-giving part. It must be remembered, however, that these are not exclusive of one another; the knowledge-giving part is not necessarily emotional, but the emotional part is and must be knowledge-giving. The pleasure or pain of the feeling are subjects of intellectual apprehension; they give the knowledge of themselves and of their varieties.—Ed.

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