Scully: [perplexed] This body has all of the secondary, but none of the primary symptoms of having been in a fire! It's almost as if...
Mulder: What?
Scully: It's almost as if his body believed that it was burning.

Scully: Good morning.
Mulder: Whatever tape you found in that VCR, it isn't mine.
Scully: Good, because I put it back in that drawer with all those other videos that aren't yours.

Scully: I was told by the Assistant Director that Mulder was gone.
Agent Morris: So?
Scully: So, whenever he's away, I feed his fish.

Scully: It is somehow easier to believe, as Agent Bocks does, in aliens and UFOs, than in the kind of cold-blooded inhuman monster who could prey on the living to scavenge from the dead.

Scully: Mulder, I don't think BJ was in the woods that night because of engine failure.
Mulder: What are you talking about?
Scully: Well, the Motel Black would have been a perfect meeting place. Away from town, away from his wife.
Mulder: What do you mean?
Scully: It's obvious BJ and Tillman are having an affair.
Mulder: How do you know?
Scully: A woman senses these things.

Scully: Mulder, this is amazing! [looking at the flukeman] its vestigial features seem parasitic, but it has primate physiology. Where the hell did it come from?
Mulder: I don't know. But it looks like I'm gonna have to tell Skinner that his suspect is a giant bloodsucking worm after all.

Scully: Thanks for ditching me.
Mulder: I'm sorry, I, uh... I couldn't let you risk your life on this.
Scully: Did you find what you were looking for?
Mulder: No... no. But I found something I thought I'd lost.
Scully gives him a questioning look:
Mulder: Faith to keep looking.

Scully:...Flatworms are what are known as obligate endoparasites. They live inside of the host entering the body through ingestion of larvae or eggs. They are not creatures that go around attacking people.
Mulder: That's good. I didn't wanna tell Skinner his murder suspect was a giant bloodsucking worm.

Sheriff Hamilton: [to Scully] Are you sure it was the brother you saw? Maybe it was the Fiji Mermaid who jumped in the sea and swam back to Fiji.
Mulder: [to Scully] Now you know how I feel.

Skinner: For every step you take they're three steps ahead.
Mulder: What about you, where do you stand?
Skinner: I stand right on the line you keep crossing.

Skinner: When I was eighteen, I, uh... I went to Vietnam. I wasn't drafted, Mulder, I- I enlisted in the Marine Corps the day of my eighteenth birthday. I did it on a blind faith. I did it because I believed it was the right thing to do. I don't know, maybe I still do. Three weeks into my tour, a ten-year-old North Vietnamese boy walked into camp covered with grenades and I, uh... I blew his head off from a distance of ten yards. I lost my faith. Not in my country or in myself, but in everything. There was just no point to anything anymore. One night on patrol, we were, uh... caught... and everyone- everyone fell. I mean, everyone. I looked down at my body from outside of it. I didn't recognize it at first. I watched the V.C. strip my uniform, take my weapon and I remained in this thick jungle... peaceful... unafraid... watching my- my dead friends. Watching myself. In the morning, the corpsmen arrived and put me in a body bag until... I guess they found a pulse. I woke in a Saigon hospital two weeks later. I'm afraid to look any further beyond that experience. You? You are not. Your resignation is unacceptable.
Mulder: (realizing) You. (exhales heavily) You gave me Cancer Man's location. You put your life in danger.
Skinner: Agent Mulder, every life, every day, is in danger. That's just life.

Skinner: There is no police report of this incident, Agent Mulder, and there is no body. You know that.
Mulder: Since I am unfamiliar with any such incident, sir, no, how would I know that?
Skinner: Knock it off!
Mulder: How's it feel? Constant denial of everything, questions answered with a question.
Skinner: I want to know what happened, damn it.
Mulder: Him. That's what happened. CANCER MAN! He's responsible for what happened to Scully!
Skinner: How do you know that?
Mulder: It's a rumor. Who is he?
Skinner: It's not your...
Mulder: Oh, you can have it all, you can have my badge, you can have the X-Files, just tell me where he is.
Skinner:And then what? He sleeps with the fishes? We're not the mafia, Agent Mulder. I know it's easy to forget but we work for the Department of Justice.
Mulder: That's what I want.
Skinner: Agent Scully was a fine officer. More than that... I liked her. I respected her. We all know the field we play on and we all know what can happen in the course of a game. If you were unprepared for all the potentials, then you shouldn't step on the field.

The Cigarette Smoking Man: Don't try and threaten me, Mulder. I've watched presidents die.

The Cigarette Smoking Man: We tell you only what you need to know.
Krycek: I think I have a right to know.
The Cigarette Smoking Man: You have no rights, only orders to be carried out. If you have a problem with that, we'll make other arrangements.

The Son: Don't you want to live forever?
Mulder: Not if drawstring pants come back in style.