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“You can tell the character of every man when you see how he gives and receives praise.” — Seneca

“To learn a man’s character, mark how he takes a favour.” — Archbishop Richard Whately

“If all else fails, the character of a man can be recognized by nothing so surely as by a jest which he takes badly.” — G.C. Lichtenberg

“To know a man, observe how he wins his object, rather than how he loses it; for when we fail, our pride supports us — when we succeed, it betrays us.” — Charles Caleb Colton

“Judge a man by his questions rather than by his answers.” — Voltaire

Also:

“The greatness of a nation and its moral progress can be judged by the way its animals are treated.” — Gandhi

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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