The Rules of the Game
by Carl Sagan
Everything morally right derives from one of four sources: it concerns either full
perception or intelligent development of what is true; or the preservation of organized
society, where every man is rendered his due and all obligations are faithfully discharged;
or the greatness and strength of a noble, invincible spirit; or order and moderation in
everything said and done, whereby is temperance and self-control.
Cicero, De Officiis, I, 5 (45-44 B.C.)