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

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

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

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

An infallible method of making fanatics is to persuade before you instruct.

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

What is objectionable, what is dangerous about extremists is not that they are extreme, but that they are intolerant. The evil is not what they say about their cause, but what they say about their opponents.

A fanatic is always the fellow on the other side.

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.

The worst vice of the fanatic is his sincerity.