There is no place in a fanatic's head where reason can enter.

— Bonaparte, Napoleon

Just as every conviction begins as a whim so does every emancipator serve his apprenticeship as a crank. A fanatic is a great leader who is just entering the room.

— Broun, Heywood

A fanatic is one who can't change his mind and won't change the subject.

— Churchill, Winston

The fanatic is incorruptible: if he kills for an idea, he can just as well get himself killed for one; in either case, tyrant or martyr, he is a monster.

— Cioran, E. M.

Fanaticism soberly defined, is the false fire of an over heated mind.

— Cowper, William

The most dangerous madmen are those created by religion, and people whose aim is to disrupt society always know how to make good use of them on occasion.

— Diderot, Denis

A fanatic is a man that does what he thinks the Lord would do if He knew the facts of the case.

— Dunne, Finley Peter

Fervor is the weapon of choice of the impotent.

— Fanon, Frantz

Fanaticism obliterates the feelings of humanity.

— Gibbon, Edward

Defined in psychological terms, a fanatic is a man who consciously over-compensates a secret doubt.

— Huxley, Aldous

A fanatic is a man who consciously over compensates a secret doubt.

— Huxley, Aldous

Mere human beings can't afford to be fanatical about anything. Not even about justice or loyalty. The fanatic for justice ends by murdering a million helpless people to clear a space for his law-courts. If we are to survive on this planet, there must be compromises.

— Jameson, Storm

In the fevered state of our country, no good can ever result from any attempt to set one of these fiery zealots to rights, either in fact or principle. They are determined as to the facts they will believe, and the opinions on which they will act. Get by them, therefore, as you would by an angry bull; it is not for a man of sense to dispute the road with such an animal.

— Jefferson, Thomas

In the history of mankind, fanaticism has caused more harm than vice.

— Kronenberger, Louis

If you see one cold and vehement at the same time, set him down for a fanatic.

— Lavater, Johann Kaspar

Fanatics are picturesque, mankind would rather see gestures than listen to reasons.

— Nietzsche, Friedrich

The worst of madmen is a saint run mad.

— Pope, Alexander

Throughout human history, the apostles of purity, those who have claimed to possess a total explanation, have wrought havoc among mere mixed-up human beings.

— Rushdie, Salman

Fanaticism consists in redoubling your efforts when you have forgotten your aim.

— Santayana, George

Wisdom becomes nonsense in the mouth of a fanatic.

— Schuwdrmer, Otto

I carry from my mother's womb a fanatic's heart.

— Yeats, William Butler