“It's not what you don't know that kills you, it's what you know for sure that ain't true.”

—  Mark Twain

The quote "It's not what you don't know that kills you, it's what you know for sure that ain't true." is famous quote attributed to Mark Twain (1835–1910), American author and humorist.

Variant: What gets us into trouble is not what we don't know. It's what we know for sure that just ain't so.

Last update Sept. 27, 2023. History

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Mark Twain 637
American author and humorist 1835–1910

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