One movie I come back to time and again is 'The Hustler.' I don't think there's better dialogue in any film.
“This is a work of fiction. All the characters in it, human and otherwise, are imaginary, excepting only certain of the fairy folk, whom it might be unwise to offend by casting doubts on their existence. Or lack thereof.”
“I believe that you live on inside the hearts and minds of everyone you've touched while you were here on earth.”