The earliest citation found in Google Books is a 1872 article by Richard Bowker: "Our Crime Against Crimes", in The Herald of Health, vol. 19 no. 2, New York: Wood & Holbrook, February 1872. The saying is placed within quotation marks, perhaps indicating that it was already well-known. | A precursor is found in the December 1859 edition of Household Monthly: "It is very well to repeat, parrot-like, the old axiom that 'the love of gold is the root of all evil;' but it is very certain that in truth—the lack of gold is the great incentive to crime."
More quotes by Mark Twain
Always do right. This will gratify some people, and astonish the rest.
You can't depend on your eyes when your imagination is out of focus.
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Attribution
Quote text and notes from Wikiquote: Mark Twain (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.