“- Inspector Burgess: We used to talk about the criminal type. Criminal type my eye. It's not how a man looks, it's how his mind works that makes him a killer.
- Jack Marlow: You mean that all great murderers have been... insane?”
Thomas Gomez - Inspector Burgess
Franchot Tone - Jack Marlow

“Did you lose your mind all at once, or was it a slow, gradual process?”

Jeff Bridges - Jack

“Apparently the mind is never too sick to make jokes about psychoanalysis.”
Michael Chekhov - Dr. Alexander Brulov

“Hell of all the things I lost, I miss my mind the most.”
Bill Paxton - Frank James

“I remained too much inside my head, and ended up losing my mind.”

Joe Mantegna - David Rossi