virtue is concerned; and in feelings and actions excess and deficiency are errors, while the mean amount is praised, and constitutes success; and to be praised and to be successful are both marks of virtue. [13] Virtue, therefore, is a mean state in the sense that it is able to hit the mean. [14] Again, error is multiform (for evil is a form of the unlimited, as in the old Pythagorean imagery,a and good of the limited), whereas success is possible in one way only (which is why it is easy to fail