An associate of mine provided the following quote. I don't know how accurate it is or who actually wrote it. Any ideas to accuracy and author?
" It is better to keep your mouth shut and presumed a fool then to open it and remove all doubt".
Thank you for any information

It’s been attributed to all the usual suspects, but seems to have its roots in the bible:
Even a fool, when he holdeth his peace, is counted wise: and he that shutteth his lips is esteemed a man of understanding. -- Bible, 'Proverbs' 17:28.

Others who came later:
"Blessed is the man, who having nothing to say, abstains from giving wordy evidence of the fact."
-George Eliot (1819-1880), author

Better to remain silent and be thought a fool than to speak out and remove all doubt.-- Abraham Lincoln (also attr. Confucius)

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 (1835-1910)