The X-Files, Season 5

Scully:
But it doesn't explain why they would want to kill me. And it doesn't explain why I survived.

Mulder:
It all comes down to a question, one that hasn't been answered or I don't think honestly addressed. Who made that chip in your neck? That chip was found in a military research facility. Our government made that chip, implanted it in your neck as part of a secret military project to develop a biochemical weapon, to monitor your immunity or to destroy you like a lab rat... if the truth were to be exposed. Your cancer, your cure. Everything that's happening to you now. It all points to that chip. The truth I've been searching for? That truth is IN you.

Scully:
(pauses, looks down) Mulder, when I met you five years ago, you told me that your sister had been abducted... by aliens. That that event had marked you so deeply that nothing else mattered. I didn't believe you, but I followed you... on nothing more than your faith that the truth was out there, based not on facts, not on science, but on your memories that your sister had been taken from you. Your memories were all that you had.

Mulder:
I don't trust those memories now.

Scully:
Whether you trust them or not, they led you here, and me. But I have no memories to either trust or distrust. And if you ask me now to follow you again, to stand behind you in what you now believe, without knowing what happened to me out there... without those memories, I can't. I won't.

Mulder:
[Stands and goes to window, pauses, then looks back at her.] If I could give you those memories, if I could prove that I was right and that what I believed for so long was wrong-

Scully:
Is that what you really want?