Insanity – a perfectly rational adjustment to an insane world. R. D. Laing
It is sometimes an appropriate response to reality to go insane. Philip K. Dick
There is a fine line between genius and insanity. I have erased this line. Oscar Levant
Religion is a collective insanity. Mikhail Bakunin
In order to act, you must be somewhat insane. A reasonably sensible man is satisfied with thinking. Georges Clemenceau
In all matters of opinion, our adversaries are insane. Oscar Wilde
In individuals, insanity is rare; but in groups, parties, nations, and epochs it is the rule. Friedrich Nietzsche
Insanity is often the logic of an accurate mind overtaxed. Oliver Wendell Holmes, Sr
The definition of insanity is doing the same thing over and over again and expecting a different result. Albert Einstein
I doubt if a single individual could be found from the whole of mankind free from some form of insanity. The only difference is one of degree. Desiderius Erasmus