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2.
[3]
But let it be granted to begin with that the whole theory of conduct is bound to be an
outline only and not an exact system, in accordance with the rule we laid down at the
beginning,1 that philosophical
theories must only be required to correspond to their subject matter; and matters of
conduct and expediency have nothing fixed or invariable about them, any more than have
matters of health. 2.
[4]
And
if this is true of the general theory of ethics, still less is exact precision possible in
dealing with particular cases of conduct; for these come under no science or professional
tradition, but the agents themselves have to consider what is suited to the circumstances
on each occasion, just as is the case with the art of medicine or of navigation.
2.
[5]
But although the
discussion now proceeding is thus necessarily inexact, we must do our best to help it
out.2.
[6]
First of all then we have to observe, that moral qualities are so constituted as to be
destroyed by excess and by deficiency—as we see is the case with bodily strength
and health (for one is forced to explain what is invisible by means of visible
illustrations). Strength is destroyed both by excessive and by deficient
exercises, and similarly health is destroyed both by too much and by too little food and
drink; while they are produced, increased and preserved by suitable quantities. 2.
[7]
The same therefore is true of
Temperance, Courage, and the other virtues.
1 See 1.3.1.