The X-Files, Season 5

Cigarette Smoking Man:
But I've come today not to ask, but to offer. To offer you the truths that you so desperately sought - about the project, about the men who conspired to protect it...

Mulder:
I know the truth.

Cigarette Smoking Man:
Do you?

Mulder:
I spoke to one of your men.

Cigarette Smoking Man:
How do you know he's not a liar?

Mulder:
I've seen enough to know he's not a liar, yeah.

Cigarette Smoking Man:
You've seen but scant pieces of the whole.

Mulder:
What more can you show me?

Cigarette Smoking Man:
This man you spoke to - Michael Kritschgau. He's deceived you with beautiful lies. He's told you that everything you ever believed about the existence of extraterrestrial life is untrue.

Mulder:
(nods) What are you saying?

Cigarette Smoking Man:
As I said, I'm offering you the chance to know the truth.

Mulder:
In exchange for what?

Cigarette Smoking Man:
Quit the FBI. Come work for me. You can make your problems go away.

Mulder:
(pauses) No deal.

Cigarette Smoking Man:
(smiles) After all I've given you?

Mulder:
(in disbelief) What have- What have you given me? The claim of a cure for Scully? Is she cured? You show me my sister only to take her right back? You've given me nothing.

Cigarette Smoking Man:
I intend to keep my promises. I just need something from you.

Mulder:
You murdered my father. You killed Scully's sister. And if Scully dies, I will kill you. I don't care whose father you are, I will put you down.

Cigarette Smoking Man:
Well you're certainly capable, so I've been told. I understand you have a hearing tomorrow, where you'll have to testify to these murderous impulses of yours. [Mulder walks away] When you reconsider, the offer still stands.