"But why must everything have a practical application? I'd been such a diligent soldier for years - working, producing, never missing a deadline, taking care of my loved ones, my gums and my credit record, voting, etc. Is this lifetime supposed to be only about duty? In this dark period of loss, did I need any justification for learning Italian other than that it was the only thing I could imagine bringing me any pleasure right now?"

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Certitude leads to violence. This is a proposition that has an easy application and a difficult one. The easy application is to ideoologues, dogmatists, and bullies--people who think that their rigtness justifies them in imposing on anyone who does not happen to suscribe to their particular ideology, dogma or notion of turf. If the conviction of rightness is powerful enough, resistance to it will be met, sooner or later by force. There are people like this in every sphere of life, and it is natural to feel that the world would be a better place without them!

— Oliver Wendell Holmes, Jr.