Librarian to Francis I 

The famous Duval, librarian to the Emperor Francis the First, often used to reply to questions that were put to him, "I do not know." An ignoramus one day said to him, "But the emperor pays you for knowing." "The emperor," he replied, "pays me for what I know; if he were to pay me for what I am ignorant of, all the treasures of his empire would not be sufficient."

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