all work and no play makes Jack a dull boy

All work and no play makes Jack a dull boy is a way of saying that if you do nothing but work with no time off to enjoy things you love, you will become very bored and boring. You may recognize the saying as a quote from the move and book The Shining by Stephen King. The meaning behind it is that a person becomes dull when all they do is work all day and night and do not get a vacation or time off for themselves.