Cicero: “But the greater the difficulty, the greater the glory; for no occasion arises that can excuse a man for being guilty of…”

The first office of justice is to keep one man from doing harm to another, unless provoked by wrong; and the next is to lead men to use common possessions for the common interests, private property for their own.

Again, there are certain duties that we owe even to those who have wronged us.

For there is a limit to retribution and to punishment; or rather, I am inclined to think, it is sufficient that the aggressor should be brought to repent of his wrong-doing, in order that he may not repeat the offence and that others may…

Whether we do the kindness or not is optional; but to fail to requite one is not allowable to a good man, provided he can make the requital without violating the rights of others.