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“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, Sudden Death

“My dad used to say the definition of stupidity was doing the same thing over and over again and expecting a different result. Or maybe that was the definition of crazy.”
― David Estes, The Moon Dwellers

“One of the better definitions of insanity - doing the exact same thing over and over and expecting the result to be different.”
― Anthony Kiedis, 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, Through the Zombie Glass

“Einstein wrote that insanity is doing the same thing over and over and expecting a different result. That said, is it crazier to repeatedly throw yourself against a window, or to repeatedly open that window, believing the creatures that are throwing themselves against it might come into your house, take a look around, and leave with no hard feelings?”
― David Sedaris

“Do you know what Albert Einstein's definition of insanity was?"
"No."
"Doing the same thing over and over and expecting different results.”
― Christian Cantrell

“Your lack of commitment to being different is what kills you. It is the insanity of doing the same thing every time and expecting a different result that wastes your time.”
― Shannon Alder

“Stupidity is doing the same thing and expecting a different result.”
― Eliezer Yudkowsky, Harry Potter and the Methods of Rationality

“To paraphrase Einstein, insanity is expecting employees to do one thing while rewarding them for doing something else.”
― Robert G. Thompson, Hooked on Customers: The Five Habits of Legendary Customer-Centric Companies

“If insanity is defined as doing the same thing over and over and expecting different results - then success is insanity squared!

(2012 SCBWI New Member Conference; Richmond, VA)”
― Brian Rock

“She’d read somewhere that the definition of crazy was doing the same thing over and over but expecting different results.”
― Laurelin Paige, Take Two