Related:

• Keep your mouth shut and people will think you stupid; Open it and you remove all doubt.
• Marge: Oh Maggie, when are you going to talk? Lisa
  Well, don't push her. Remember, it is better to remain silent and be thought a fool than open your mouth and remove all doubt....
• Keep your chin up, it helps you keep your mouth shut.
• When you are in it up to your ears, keep your mouth shut.
• If you keep your mouth shut you'll never put your foot in it.
• When you are in it up to your ears, keep your mouth shut.