Happiness, then, is something final and
self-sufficient, and is the end of action.
Presumably, however, to say that happiness is the chief good seems a
platitude, and a clearer account of what it is still desired. This
might perhaps be given, if we could first ascertain the function of
man. For just as for a flute-player, a sculptor, or an artist, and, in
general, for all things that have a function or activity, the good and
the 'well' is thought to reside in the function, so would it seem to
be for man, if he has a function. Have the carpenter, then, and the
tanner certain functions or activities, and has man none? Is he born
without a function? Or as eye, hand, foot, and in general each of
the parts evidently has a function, may one lay it down that man
similarly has a function apart from all these? What then can this
be? Life seems to be common even to plants, but we are seeking what is
peculiar to man. Let us exclude, therefore, the life of nutrition
and growth. Next there would be a life of perception, but it also
seems to be common even to the horse, the ox, and every animal.
There remains, then, an active life of the element that has a rational
principle; of this, one part has such a principle in the sense of
being obedient to one, the other in the sense of possessing one and
exercising thought.
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