he who is rightly punished ought either to become better and profit by it, or he ought to be made an example to his fellows, that they may see what he suffers, and fear and become better. Those who are improved when they are punished by gods and men, are those whose sins are curable; and they are improved, as in this world so also in another, by pain and suffering; for there is no other way in which they can be delivered from their evil.
Purgatory
