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Cornelius Tacitus when he says, that “men are readier to pay back injuries than benefits, since to requite a benefit is felt to be a burthen, to return an injury a gain.
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Niccolò Machiavelli (Greatest Works of Niccolò Machiavelli: The Prince, The Art of War, Discourses on the First Decade of Titus Livius & History of Florence)