Sometimes it's a good idea to just keep your mouth shut. Does that sound nasty? Hope not!
As a little girl my favorite grandmother would often speak to me in French. She was a woman of stature & the epitome of, "keeping it classy!" Oftentimes she would let me know I was out of line by saying, "Ferme la bouche." I knew what it meant & I still do. It means shut your mouth. Think more, talk less.