Deep Throat : "You're awfully quiet, Mr. Mulder."
Mulder : "I'm wondering which lie to believe."

Deep Throat : "A lie, Mr. Mulder, is most convincingly hidden between two truths."

Scully : "I have never met anyone so passionate and dedicated to a belief as you. It's so intense that sometimes it's blinding. But there are others who are watching you, who know what I know and, whereas I can respect and admire your passion, they will use it against you. Mulder, the truth is out there, but so are lies."