Insanity: doing the same thing over and over again and expecting different results. (Quote by - Albert Einstein)

Like men condemned to thunderbolts, Who, ere the blow, become mere dolts. (Quote by - Samuel Butler)

I teach that all men are mad. (Quote by - Horace)

Much madness is divinest sense To a discerning eye; Much sense the starkest madness. 'Tis the majority In this, as all, prevails Assent, and you are sane; Demur,--you're straightway dangerous, And handled with a chain. (Quote by - Emily Dickinson)

But when Fate destines one to ruin it begins by blinding the eyes of his understanding. (Quote by - James Baillie Fraser)

Madam, I swear I use no art at all. That he is mad, 'tis true: 'tis true 'tis pity, And pity 'tis 'tis true--a foolish figure. (Quote by - William Shakespeare)

Sanity is very rare: every man almost, and every woman, has a dash of madness. (Quote by - Ralph Waldo Emerson)

No excellent soul is exempt from a mixture of madness. (Quote by - Aristotle)

Though this be madness, yet there is method in't. (Quote by - William Shakespeare)

Better mad with the rest of the world than wise alone. (Quote by - Baltasar Gracian)

In order to act, you must be somewhat insane. A reasonably sensible man is satisfied with thinking. (Quote by - Georges Clemenceau)

No man is sane who does not know how to be insane on proper occasions. (Quote by - Henry Ward Beecher)

The alleged power to charm down insanity, or ferocity in beasts, is a power behind the eye. (Quote by - Ralph Waldo Emerson)

Insanity is the only sane reaction to an insane society. (Quote by - Thomas Szas)

I teach that all are men are mad. (Quote by - Quintus Horatius Flaccus)

Some are born mad. Some remain so. (Quote by - Samuel Beckett)

For those whom God to ruin has designed He fits for fate, and first destroys their mind. (Quote by - John Dryden)

It shall be so. Madness in great ones must not unwatched go. (Quote by - William Shakespeare)

Insanity is hereditary; you can get it from your children (Quote by - Sam Levenson)

We cannot unthink unless we are insane. (Quote by - Arthur Koestler)

Whom God wishes to destroy, he first makes mad. (Quote by - Proverb)

Insanity in individuals is something rare -- but in groups, parties, nations, and epochs it is the rule. (Quote by - Friedrich Nietzsche)

My dear Sir, take any road, you can't go amiss. The whole state is one vast insane asylum. (Quote by - James L. Petigru)

Go, madman! rush over the wildest Alps, that you may please children and be made the subject of declamation. (Quote by - Decimus Junius Juvenal)

The distance between insanity and genius is measured only by success. (Quote by - Bruce Feirstein)