The true person inside of us. The person we hide because were to embarassed to show it in public.
It's insane that people are quoting "Insanity is when you do something over and over and expect different results."-Albert Enstien, yet you find people keep saying it over and over in this definition.
Doing the same thing over and over again, but expecting a different result each time.
Murdering multiple people with a knife, getting mad because of the blood that stains your new shirt each time, and not changing your methods could be used as an example of insanity, on two levels.