So much of left-wing thought is a kind of playing with fire by people who don't even know that fire is hot.
— George Orwell

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

The question is not whether we will be extremists, but what kind of extremists we will be.
— Martin Luther King, Jr.

Extreme positions are not succeeded by moderate ones, but by contrary extreme positions.
— Friedrich Nietzsche

Fanatics are picturesque, mankind would rather see gestures than listen to reasons.
— fanaticism quotation by Friedrich Nietzsche