„The only man who makes no mistakes is the man who never does anything.“

—  Theodore Roosevelt, As quoted by Jacob A. Riis in Theodore Roosevelt, the Citizen (1904), chapter XVI A Young Men's Hero http://www.bartleby.com/206/16.html
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Theodore Roosevelt2
amerikai politikus, az Amerikai Egyesült Államok 26. elnöke… 1858 - 1919

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„A man who can laugh, if only at himself, is never really miserable.“

—  H.L. Mencken American journalist and writer 1880 - 1956
Context: Human life is basically a comedy. Even its tragedies often seem comic to the spectator, and not infrequently they actually have comic touches to the victim. Happiness probably consists largely in the capacity to detect and relish them. A man who can laugh, if only at himself, is never really miserable. 15

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„Anyone who has never made a mistake has never tried anything new.“

—  Albert Einstein German-born physicist and founder of the theory of relativity 1879 - 1955

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