Prov. It is not healthy for someone to work all the time and never play. (Often used to exhort someone to stop working, or to justify why you have stopped working. You can substitute the name of the person you are addressing for Jack.) Don't come to the office this weekend. All work and no play makes Jack a dull boy. I'd like to take a week's vacation next month. All work and no play makes Jack a dull boy.