That's not the definition of insanity. It's something Einstein said.
I stopped reading after that sentence. tl/dr
in⋅san⋅i⋅ty /insæniti:/
noun
relatively permanent disorder of the mind
English
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If you read the second sentence you'd see I said it was a cliche and not true. It just made for a catchy title.
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I wasn't lying when I said I didn't read that far.