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And how can it be a Generation? because, according to notions

generally held, not anything is generated from anything, but a

thing resolves itself into that out of which it was generated:

whereas of that of which Pleasure is a Generation Pain is a

Destruction.

Again, they say that Pain is a lack of something suitable to

nature and Pleasure a supply of it.

But these are affections of the body: now if Pleasure really is a

supplying of somewhat suitable to nature, that must feel the

Pleasure in which the supply takes place, therefore the body of

course: yet this is not thought to be so: neither then is

Pleasure a supplying, only a person of course will be pleased

when a supply takes place just as he will be pained when he is

cut short.

This notion would seem to have arisen out of the Pains and

Pleasures connected with natural nourishment; because, when

people have felt a lack and so have had Pain first, they, of

course, are pleased with the supply of their lack.