The whole problem with the world is that fools and fanatics are always so sure of themselves and wiser people so full of doubt.

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

Tolerance and freedom of thought are the veritable antidotes to religious fanaticism.

One defeats the fanatic precisely by not being a fanatic oneself, but on the contrary by using one's intelligence.

Scratch a fanatic and you find a wound that never healed.

Fanatics seldom laugh. They never laugh at themselves.

The worst vice of the fanatic is his sincerity.

When people are fanatically dedicated to political or religious faiths or any other kind of dogmas or goals, it's always because these dogmas or goals are in doubt.

A fanatic is always the fellow on the other side.

Fanaticism is not a state of religion but a state of mind.

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

A fanatic is a man who consciously overcompensates for a secret doubt.

A fanatic is someone who redoubles his effort when he has forgotten his aim.