Insanity: doing the same thing over and over again and expecting different results.
History is the same thing over and over again.
Insanity in individuals is something rare - but in groups, parties, nations and epochs, it is the rule.
I became insane, with long intervals of horrible sanity.
For me, insanity is super sanity. The normal is psychotic. Normal means lack of imagination, lack of creativity.
When we remember we are all mad, the mysteries disappear and life stands explained.
In a mad world only the mad are sane.
The statistics on sanity are that one out of every four Americans is suffering from some form of mental illness. Think of your three best friends. If they're okay, then it's you.
There's a fine line between genius and insanity. I have erased this line.
Insanity is often the logic of an accurate mind overtasked.
There's a fine line between genius and insanity, as we all know.
There is a pleasure in being mad, which none but madmen know.
The distance between insanity and genius is measured only by success.
No man is sane who does not know how to be insane on proper occasions.
The difference between insanity and genius is measured only by success and failure.
You're only given a little spark of madness. You mustn't lose it.
Though this be madness, yet there is method in't.
Insanity is relative. It depends on who has who locked in what cage.
No excellent soul is exempt from a mixture of madness.
A man who is 'of sound mind' is one who keeps the inner madman under lock and key.