If, then, every art or science perfects its work in this way, looking to the mean and bringing its work up to this standard (so that people are wont to say of a good work that nothing could be taken from it or added to it, implying that excellence is destroyed by excess or deficiency, but secured by observing the mean; and good artists, as we say, do in fact keep their eyes fixed on this in all that they do), and if virtue, like nature, is more exact and better than any art, it follows that virtue also must aim at the mean—virtue of course meaning moral virtue or excellence; for it has to do with passions and actions, and it is these that admit of excess and deficiency and the mean. For instance, it is possible to feel fear, confidence, desire, anger, pity, and generally to be affected pleasantly and painfully, either too much or too little, in either case wrongly; but to be thus affected at the right times, and on the right occasions, and towards the right persons, and with the right object, and in the right fashion, is the mean course and the best course, and these are characteristics of virtue. And in the same way our outward acts also admit of excess and deficiency, and the mean or due amount.
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