Use your head and it will save your ass

SKINNER: Misidentification of a corpse and subsequent unrequested autopsy...

SCULLY: Sir, the dead man looked very much like Micah Hoffman. He had Hoffman's I.D. on him...

SKINNER: Agent... more

(voiceover) Every minute of every day we choose. Who we are. Who we forgive. Who we defend and protect. To choose a side or to walk the line. To play the middle. To straddle the fence between what is... more

You could bring home a flying saucer and have an alien shake hands with the President … what it comes down to Agent Mulder is … they don't like you.

Mulder: "What's our punishment this time? Thumbscrews or 40 lashes? Come on in, Walter. Sit a spell. This could be the last time you take a trip down to these offices."
Skinner: "You... more

That will be all.

Skinner: So this kid is a human oddity. Tell me why anyone would go to such lengths as to kill him?
Mulder: This kid may be the key not just to all human potential, but to all spiritual unexplained... more

Agent Mulder, think very carefully about the next words that come out of your mouth.

This is where you pucker up and kiss my ass!

You can't ask the truth of a man who deals in lies.