Expert

"It is difficult being an expert in a subject everybody understands. It may even be more difficult to be an expert in a subject which everybody thinks they understand. In this regard, I do not envy football coaches but being an economist has something of the same aspect".
Franklin Fisher

Apocalypse Now

Willard: They told me that you had gone totally insane, and, uh, that your methods were unsound
Colonel Kurtz: Are my methods unsound?
Willard: I don't see any method at all, sir