How we cite our quotes: All quotations are from Close Encounters of the Third Kind.
Quote #4
RONNIE: Roy, look. Don't talk about this until you know what you're talking about.
ROY: Ronnie, that's crazy. If I can't talk about it, then how am I gonna know what's going on?
RONNIE: What?
Not to put too fine a point on a complex subject, but communication is how we acquire knowledge. It's what is happening right now as you read these words. Roy can't acquire knowledge about his experience without communicating with others. Ronnie can't handle the challenge to her worldview and wants him to just shut up.
Quote #5
MAJOR WALSH: That's good. I like that. But it may not evacuate everybody. There's always some joker who thinks he's immune. What I need is something so scary, it'll clear 300 square miles of every living Christian soul.
Major Walsh uses modern means of communication, such as the TV news, to spread disinformation and fear. In doing so, he hides the knowledge of the alien encounter, the exact opposite of what the film argues communication should do.
Quote #6
PROJECT LEADER: The only thing these phrases have in common are five signals.
MAN: I hope somebody's taking all this down.
SYNTHESIZER PLAYER: What are we saying to each other?
PROJECT LEADER: It seems they're trying to teach us a basic tonal vocabulary.
MAN: It's the first day of school, fellas.
At the film's conclusion, we see communication open up between the humans and extraterrestrials. We have no idea what they're saying, and neither do the humans, but you can't learn everything on the first day of school.