But the pleasures
that do not involve pains do not admit of excess; and these are
among the things pleasant by nature and not incidentally. By things
pleasant incidentally I mean those that act as cures (for because as a
result people are cured, through some action of the part that
remains healthy, for this reason the process is thought pleasant);
by things naturally pleasant I mean those that stimulate the action of
the healthy nature.
There is no one thing that is always pleasant, because our nature is
not simple but there is another element in us as well, inasmuch as
we are perishable creatures, so that if the one element does
something, this is unnatural to the other nature, and when the two
elements are evenly balanced, what is done seems neither painful nor
pleasant; for if the nature of anything were simple, the same action
would always be most pleasant to it. This is why God always enjoys a
single and simple pleasure; for there is not only an activity of
movement but an activity of immobility, and pleasure is found more
in rest than in movement. But 'change in all things is sweet', as
the poet says, because of some vice; for as it is the vicious man that
is changeable, so the nature that needs change is vicious; for it is
not simple nor good.
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