I've seen it widely quoted, generally attributed to Benjamin Franklin or Albert Einstein. Back then I did a Google search, and found both those attributions, along with others that stated definitively that it was NOT either Franklin or Einstein. So where did it come from? I shrugged and moved on.
Until today. There was a post on Balloon Juice that once again quoted "The definition of insanity is doing the same thing over and over and expecting different results," attributing it to Franklin.
I guess Wikiquotes has gotten on the case in the time since I last explored this, because someone in the comments was able to direct us to the answer... In fact, the line comes from Rita Mae Brown, in her mystery novel Sudden Death (Bantam Books, New York, 1983, p. 68).
Franklin is one of those classic American "wise men" (ie: Jefferson, Lincoln, Twain) to whom many "pithy" statements often get attributed; attributions without a verifiable source should be treated with some skepticism (Wikiquotes)So, now we know! Of course, I can't resist noting that once again, lazy intellectuals forget the name of a smart woman and transfer her wisdom to dead white males....