Original artwork, not a still
A fanatic is one who can't change his mind and won't change the subject.
Behind the line
What it means
Our interpretation.
The speaker defines a fanatic by two closed doors: no willingness to revise an opinion and no willingness to talk about anything else. It is a compact jibe at obsessive certainty, suggesting the problem is less passion than a mind that neither bends nor wanders.
Context reviewed
