“You know… you keep doing the same things and you keep getting the same result over and over again.”
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Warren Buffett 146
American business magnate, investor, and philanthropist 1930Related quotes
“Insanity is doing the same thing over and over again but expecting different results.”
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.
Misattributed

On staying in top form despite suffering a stroke in 2016 in “Roberta Flack Ready to Sing Again at Jazz Foundation of America Honors” https://www.billboard.com/articles/columns/pop/8479635/roberta-flack-ready-to-sing-again-jazz-foundation-of-america-honors in Billboard (2018 Oct 12)

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May 24, 2005 http://georgewbush-whitehouse.archives.gov/news/releases/2005/05/20050524-3.html
2000s, 2005

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

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