Book 2
9
If therefore the way in which every art or science performs its work well is by looking to the mean and applying that as a standard to its productions (hence the common remark about a perfect work of art, that you could not take from it nor add to it—meaning that excess and deficiency destroy perfection, while adherence to the mean preserves it)—if then, as we say, good craftsmen look to the mean as they work, and if virtue, like nature, is more accurate and better than any form of art, it will follow that virtue has the quality of hitting the mean.
10
I refer to moral virtue,The formula of the mean does not apply to the intellectual virtues. for this is concerned with emotions and actions, in which one can have excess or deficiency or a due mean. For example, one can be frightened or bold, feel desire or anger or pity, and experience pleasure and pain in general, either too much or too little, and in both cases wrongly;
11
whereas to feel these feelings at the right time, on the right occasion, towards the right people, for the right purpose and in the right manner, is to feel the best amount of them, which is the mean amount—and the best amount is of course the mark of virtue.
