“It is better to keep your mouth shut and appear stupid than to open it and remove all doubt.”
Cited as an example of "What Mark Twain Didn't Say" in Mark Twain by Geoffrey C. Ward, et al.
Misattributed
Variant: It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.
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Mark Twain 637
American author and humorist 1835–1910Related quotes

“Tis better people think you a fool, then open your mouth and erase all doubt.”
Variously attributed to Lincoln, Elbert Hubbard, Mark Twain, Benjamin Franklin and Socrates
Misattributed
Variant: It is better to be silent and be thought a fool than to speak and remove all doubt.

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

Interview in The Guardian (2011)

Original quote:
For my friend said that he opened his intellect as the sun opens the fans of a palm tree, opening for opening's sake, opening infinitely for ever. But I said that I opened my intellect as I opened my mouth, in order to shut it again on something solid. I was doing it at the moment. And as I truly pointed out, it would look uncommonly silly if I went on opening my mouth infinitely, for ever and ever.
The Extraordinary Cabman, one of many essays collected in Tremendous Trifles (1909)
Misattributed
“You are a shithead, Williamson. If you can't think on your feet you oughta keep your mouth shut.”
Glengarry Glen Ross (1993), Shelley Levene

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