Fanaticism, the false fire of an overheated mind.

Fanaticism is . . . overcompensation for doubt.

A fanatic is one who sticks to his guns whether they're loaded or not.

Fanatics have their dreams, wherewith they weave a paradise for a sect.

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

There is no strong performance without a little fanaticism in the performer.