Cicero: “It is virtue, virtue, which both creates and preserves friendship.”

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.

For self-control is the foe of the passions, and the passions are the handmaids of pleasure.

For we may well be guided by those fundamental principles of justice which I laid down at the outset: first, that no harm be done to anyone; second, that the common interests be conserved.

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…