agnosticism alfie kohn altruism ancient greece ancient rome antisthenes beauty bertrand russell celebrity competition consciousness conspiracy theory consumerism cynic dog dorothy parker fanaticism geoffrey chaucer greed greek language greeks happiness human nature idealism irony jonathan swift management mark twain materialism money nature nihilism original sin oxford english dictionary patriotism personal life pessimism peter sloterdijk philosophy pope john paul ii progress religion responsibility sarcasm satire sincerity skepticism society survival of the fittest truth virtue voltaire western culture wikiquote wiktionary