One of the many things on the Internet that Albert Einstein didn’t say and has added to great viral fodder and debates….
“The definition of insanity is doing the same thing over and over and expecting different results.”
In the blog piece, “Debunking Fake Albert Einstein Quotes,” found at: http://skepticaesoterica.com/debunking-fake-albert-einstein-quotes/#comment-45585
There is no evidence Einstein ever said this. The likely origin of this quote is from the Basic Texts of Narcotics Anonymous, which is the first known source of this quote. The Basic Texts were first drafted to members in 1981 and published in 1983
More on this misattribution can be found in a 2009 Psychology Today article on Insanity by Ryan Howes, Ph.d.:http://www.psychologytoday.com/blog/in-therapy/200907/the-definition-insanity-is
Where did this saying come from? It’s attributed to Albert Einstein (probably not), Benjamin Franklin (probably not), Mark Twain (probably not) and mystery writer Rita Mae Brown (probably so) who used it in her novel Sudden Death. It’s not clear who said it first, but according to at least one blogger it’s “the dumbest thing a smart person ever said.” The catchy saying has gathered steam in the past few years (example I, II, III), and regardless of the source, it’s gotten a lot of mileage.