All work and no play makes Jack a dull boy

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It means without time off from work, a person becomes both bored and boring. It is often shortened to "all work and no play".

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The first record of the proverb in print is in the collections of proverbs published by James Howell, 1853 Paroimiographia Proverbs, or, Old sayed sawes & adages in English: All work and no play, makes Jack a dull boy.