C H A P. VI.
I.
TjT~AI N and pleafure are produced in men's minds by the action of A certain caufes. But the quantity of pleafure and pain runs not uniformly in proportion to the caufe; in other words, to the quantity of force exerted by fuch caufe. The truth of this obfervation refts not upon any metaphyfical nicety in the import given to the terms MK/ quantity, and force:, itwill be equally true in whatfoever manner fuch force be meafured.
II.
The difpofition which any one has to feel fuch or fuch a quantity of pleafure or pain, upon the application of a caufe of given force, is what we terrn the degree or quantum of his fenfibility. This may be either general, referring to the fum of the caufes that aa: upon him during a. L given period or particular, referring to the action of any one particular caufe, or fort of caufe.
111.
But in the fame mind fuch and fuch caufes of pain or pleafure will produce more pain or pleafure than fuch or fuch other caufes of pain or pleafure and this proportion will in different minds be different. The diipofition which any one has to have the proportion in which he is arfected by two fuch caufes, different from that in which another man is anected by the fame two causes, may be termed the quality or bias ofhis fenribility. One man, for InMance, may be moft anected by the pleafures of the tafte, another by thofe of the ear. So alto. if there be a difference in thé nature or proportion of two pains or pleafures which they reipec~ively experience from the fame caufe a cafe not fo fréquent as the former. From the fame injury, for inftance, one man may feel the famé quantity of grief and refentment together as another man but one of them fhall feel a greater fhare of grief than of refentment the other, a greater fhare of refentment than of grief.