Legatio Ad Gaium

Unless, indeed, we ought to class his correction among his beneficent powers, not only because such a display is a portion of his laws and ordinances (for law is made up of two things, the honour of the good, and the chastisement of the wicked), but also because punishment reproves, and very often even corrects, and ameliorates those who have done wrong; and if it fails to do so with respect to them, at all events it does so to those who are near the offenders thus punished; for the punishment of others makes most men better, for fear lest they themselves should suffer the same things.