„The small amount of foolery wise men have makes a great show.“

— William Shakespeare

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„No, that is the great fallacy: the wisdom of old men. They do not grow wise. They grow careful.“
— Ernest Hemingway
„Trust men and they will be true to you; treat them greatly, and they will show themselves great.“
— Ralph Waldo Emerson
„Wisdom is, I suppose, the right use of knowledge. To know is not to be wise. Many men know a great deal, and are all the greater fools for it. There is no fool so great a fool as a knowing fool. But to know how to use knowledge is to have wisdom.“
— Charles Spurgeon