"It is better to remain silent and be thought a fool than to open
one's mouth and remove all doubt."

I believed this is attributable to Mark Twain, and said so
publicly only to be gleefully told by a colleague afterwards
"Mark Twain didn't say that, Lincoln did!"  Should I have been
embarrassed?

I recall, I think, later finding it attributed to MT in a little
book called "The Wit and Wisdom of Mark Twain," but without any
citation.  Can anyone clear this up for me?  Thanks.

David W. Thorne
Seattle, WA