We have sufficiently explained, then, that moral virtue is moderation or observance of the mean, and in what sense, viz. (1) as holding a middle position between two vices, one on the side of excess, and the other on the side of deficiency, and (2) as aiming at the mean or moderate amount both in feeling and in action.
And on this account it is a hard thing to be good; for finding the middle or the mean in each case is a hard thing, just as finding the middle or centre of a circle is a thing that is not within the power of everybody, but only of him who has the requisite knowledge.
Thus anyone can be angry—that is quite easy; anyone can give money away or spend it: but to do these things to the right person, to the right extent, at the right time, with the right object, and in the right manner, is not what everybody can do, and is by no means easy; and that is the reason why right doing is rare and praiseworthy and noble.