Quoting Mark Twain

Harry Truman used to have a sign on his desk, which I’ve liked since I first heard of it, quoting Mark Twain:

“Always do right. This will gratify some people and astonish the rest.”

A while ago (might it have been used by Al Gore in An Inconvenient Truth?) I came across another Mark Twain quote (or more exactly, a quote attributed to Mark Twain) which I have been using from time to time in workshops to remind people of the dangers of certainty:

“It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain’t so.”
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