Mulder: I know what I saw, Scully, and I know what I believed happened.
Scully: Even if it can never be proven?
Mulder: Never? Never is a very long time, Scully, you said it yourself, “although multidimensionality suggests infinite outcomes in an infinite number of universes, each universe can produce only one outcome.”
Scully: I was 23 when I wrote that.
Mulder: Yeah, but I take that to mean that you were suggesting that time can’t be altered, which means that the elder Jason Nichols’ attempts to stop his own research will fail, and that eventually his compound and time travel will be discovered.