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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.