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

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.

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

Fanaticism obliterates the feelings of humanity.

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

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.

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

Wisdom becomes nonsense in the mouth of a fanatic.

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