Madness is the result not of uncertainty but of certainty.

- Friedrich Nietzsche

Madness is to think of too many things in succession too fast, or of one thing too exclusively.

- Voltaire

It is no measure of health to be well adjusted to a profoundly sick society.

- Jiddu Krishnamurti

There is no great genius without some touch of madness.

- Seneca

No man is sane who does not know how to be insane on proper occasions.

- Henry Ward Beecher

Insanity is often the logic of an accurate mind overtasked.

- Oliver Wendell Holmes, Sr.

The distance between insanity and genius is measured only by success.

- Bruce Feirstein

Insanity: doing the same thing over and over again and expecting different results.

- Albert Einstein

Love: a temporary insanity, curable by marriage.

- Ambrose Bierce

There's a fine line between genius and insanity. I have erased this line.

- Oscar Levant