“The definition of insanity is doing the same thing over and over and expecting different results.”

— Benjamin Franklin

Misattributed to various people, including Albert Einstein and Mark Twain. An early occurrence was used as a teaching reference at University of California, Irvine in social science lectures in the later 1960s. Also found in a 1981 text from Narcotics Anonymous.
Misattributed

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Benjamin Franklin183

American author, printer, political theorist, politician, p… 1706–1790

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“The definition of insanity is doing the same thing over and over and expecting different results.”

Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity

Variously attributed also to Benjamin Franklin and Mark Twain. The earliest known occurrence, and probable origin, is from a 1981 text from Narcotics Anonymous: "Insanity is repeating the same mistakes and expecting different results." Cf. Rita Mae Brown#Misattributed.
Misattributed
Variant: Insanity: doing the same thing over and over again and expecting different results.

“One of the better definitions of insanity - doing the exact same thing over and over and expecting the result to be different.”

Anthony Kiedis book Scar Tissue

Source: Scar Tissue

“Do you know the definition of insanity? Doing the same thing over and over and expecting different results."

"Wrong. That's the definition of determination.”

Gena Showalter (1975) American writer

Source: Through the Zombie Glass

“Insanity is doing the same thing over and over again but expecting different results.”

Rita Mae Brown (1944) Novelist, poet, screenwriter, activist

Brown did include this quote in her book Sudden Death (Bantam Books, New York, 1983), p. 68, but it appears she was just paraphrasing a quote that had already been written elsewhere. The earliest known appearance of a similar quote is the "approval version" of the Narcotics Anonymous "Basic Text" released in November 1981, which included the quote "Insanity is repeating the same mistakes and expecting different results." A PDF scan of the 1981 approval version can be found here http://www.nauca.us/wp-content/uploads/2015/04/1981-11-Basic-Text-Approval-Form-White.pdf, with the quote appearing on p. 11 (p. 25 of the PDF), at the end of the fourth paragraph (which begins "We have a disease; progressive, incurable and fatal"). More in this article https://quoteinvestigator.com/2017/03/23/same/ on Quote Investigator website. <br class="br">Misattributed

“The definition of insanity is doing the same thing and expecting a different result.”

Robert T. Kiyosaki (1947) American finance author , investor

Rich Dad Poor Dad: What the Rich Teach Their Kids About Money-That the Poor and the Middle Class Do Not!

“Unfortunately, Susan didn't remember what Jane Fulton once said, 'Insanity is doing the same thing, over and over again, but expecting different results.”

Rita Mae Brown (1944) Novelist, poet, screenwriter, activist

Source: Sudden Death

“You know… you keep doing the same things and you keep getting the same result over and over again.”

Warren Buffett (1930) American business magnate, investor, and philanthropist

“If we do something over and over, it becomes normal. If we see the same thing over and over, it becomes normal.”

Chimamanda Ngozi Adichie We Should All Be Feminists

Source: We Should All Be Feminists

“I like to try different things. A good strong character and a good story are the key things for me when I'm considering a script. But I don't want to do the same kinds of things over and over. I like to challenge myself and do projects that dare to push the limits.”

Matt Dillon (1964) American actor

Dennis King (January 12, 1990) "Matt Dillon - This Era's James Dean - 'Drugstore Cowboy' Star Takes Critics' Award, Speculation About Oscar Nomination in Stride", Tulsa World, p. C1.

“Maybe we were all destined to just keep doing the same stupid things, over and over again, never really learning a single thing.”

Sarah Dessen book Along for the Ride

Source: Along for the Ride

“The definition of insanity is doing the same thing over and over and expecting different results.”

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