But what are “right” acts? In the first place, they are those that conform to a rule—to the right rule, and ultimately to reason. The Greeks never waver from the conviction that in the end moral conduct is essentially reasonable conduct. But there is a more significant way of describing their “rightness,” and here for the first time Aristotle introduces his famous “Doctrine of the Mean.” Reasoning from the analogy of “right” physical acts, he pronounces that rightness always means adaptation or adjustment to the special requirements of a situation. To this adjustment he gives a quantitative interpretation. To do (or to feel) what is right in a given situation is to do or to feel just the amount required—neither more nor less: to do wrong is to do or to feel too much or too little—to fall short of or over-shoot, “a mean” determined by the situation. The repetition of acts which lie in the mean is the cause of the formation of each and every “goodness of character,” and for this “rules” can be given.
(2) What then is a “moral virtue,” the result of such a process duly directed? It is no mere mood of feeling, no mere liability to emotion, no mere natural