“Its better to be thought a fool, than to open one's mouth and remove all doubt.”
“It is better to keep your mouth closed and appear a fool than to open it and remove all doubt.”
“It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt. ~Mark Twain~”
“It's better to keep your mouth shut and appear stupid than open it and remove all doubt”
“It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.”
“It is better to remain silent at the risk of being thought a fool, than to talk and remove all doubt of it.”