“No one has a finer command of language than the person who keeps his mouth shut.”

“It is better to keep your mouth shut and appear stupid than to open it and remove all doubt.”

“"A newspaper man has got to know when to keep his mouth and his mind shut. You might end up dead."
"Isn't that the usual fate of men, Harry?"”

“Life is fraught with opportunities to keep your mouth shut.”

“Never miss a chance… to keep your mouth shut.”

“no' when no one answered, Derek looked from face to face, then settled his glower in me. 'absolutely not.'
'um, I was the one keeping my mouth shut' I said.”

“Half of seeming clever is keeping your mouth shut at the right times.”

“If you only ever read one book in your life… I highly recommend you keep your mouth shut.”

“Once in a while it happens that I vomit up a bunny… it's not reason for one to blush and isolate oneself and to walk around keeping one's mouth shut.”

“The first thing a psychologist learns is to keep her mouth shut around laymen.”