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“The greatest deception men suffer is from their own opinions.” — Leonardo

“Convictions are more dangerous enemies of truth than lies.” — Nietzsche

“Opinions have caused more ills than the plague or earthquakes on this little globe of ours.” — Voltaire

“The most difficult subjects can be explained to the most slow-witted man if he has not formed any idea of them already; but the simplest thing cannot be made clear to the most intelligent man if he is firmly persuaded that he knows already, without a shadow of doubt, what is laid before him.” — Tolstoy

“Nothing is so firmly believed as that which we least know.” — Montaigne

“Opinions are made to be changed, or how is truth to be got at?” — Lord Byron

“Nothing is more conducive to peace of mind than not having any opinions at all.” — G.C. Lichtenberg

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“It is well to read everything of something and something of everything.” — Henry Brougham

“Try to learn something about everything and everything about something.” — Inscribed on Thomas Huxley’s memorial

“The whole secret of life is to be interested in one thing profoundly and in a thousand things well.” — Horace Walpole

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“Good can imagine Evil, but Evil cannot imagine Good.” — W.H. Auden

“Good men seek it by the natural means of the virtues; evil men, however, try to achieve the same goal by a variety of concupiscences, and that is surely an unnatural way of seeking the good. Don’t you agree?” — Boethius

“For never, never, wicked man was wise.” — Homer

“Men may keep a sort of level of good, but no man has ever been able to keep on one level of evil.” — G.K. Chesterton

American artist Dennis Oppenheim denied that his 1997 Device to Root Out Evil, above, had an anti-religious message. “Pointing a steeple into the ground directs it to hell as opposed to heaven,” he told one interviewer. “It’s a very simple gesture.”