Did Einstein really say the “definition of insanity” quote?
There is no good evidence that he did. The saying appears in print decades after Einstein’s death and was attached to his name later.
Quick Answer
The line “insanity is doing the same thing over and over and expecting different results” is widely credited to Albert Einstein, but researchers have not found it in his writings, speeches, letters or interviews. Einstein died in 1955. Closely related versions appear in recovery literature around 1981, and the familiar wording appeared in Rita Mae Brown’s 1983 novel “Sudden Death.” Reference works on Einstein list the attribution as unsupported. So the clean answer is: useful saying if you like it, but not a verified Einstein quote.
By the Numbers
Key Facts
- Einstein died
- 1955
- Earliest documented versions
- Al-Anon and Narcotics Anonymous materials, 1981
- Einstein attribution
- Appears later and is unsupported by a primary source
Timeline
- 1879
Albert Einstein is born.
- 1955
Einstein dies. None of his known letters, speeches, books or interviews contains the saying.
- Oct 1981
Earliest strong match found so far: a Knoxville, Tennessee, newspaper article about an Al-Anon meeting.
- Nov 1981
A Narcotics Anonymous pamphlet says: “Insanity is repeating the same mistakes and expecting different results.”
- 1983
Rita Mae Brown’s novel “Sudden Death” gives a character the familiar wording.
- Today
The line is widely credited to Einstein, with no primary source to back it up.
How to check a quote
- Find the original
Look for a book, letter, speech, interview or recording from the person’s lifetime.
- Check the dates
If the earliest appearance comes after the person died, be skeptical.
- Ask the quote detectives
Researchers like Quote Investigator trace sayings back through old books, newspapers and databases.
- Don’t count copies
Thousands of websites repeating a quote aren’t evidence when they all copy one another.
Why famous people collect stray quotes
Aphorisms often gain authority when a famous name is attached. Einstein, Mark Twain, Churchill and Franklin are magnets for statements that sound clever enough to belong to them.
What quote verification looks for
Strong attribution needs a contemporaneous book, speech, letter, interview, transcript or reliable witness. Repeating a quote on thousands of websites is not evidence if they all copy one another.
What we can say with confidence
The Einstein attribution is not supported by known primary evidence, and the saying’s documented trail becomes visible decades after his death. The exact original author remains uncertain.
Myth vs. Fact
MythEinstein defined insanity as doing the same thing and expecting different results.
FactThere’s no evidence he said it. The saying first shows up in 1981, 26 years after his death.
The Bottom Line
There’s no evidence Einstein ever said it. The saying first appears in 1981, 26 years after his death, and its original author is still unknown.