Mulder: Do you believe in the existence of extra terrestrials?
Scully: Logically, I'd have to say no. Given the distances
needed to travel from the far reaches of space the
energy requirement would exceed a space craft's
capabilities...
Mulder: Conventional wisdom, though when convention, and
science offer us no answer might we not finally turn
to the fantastic as a plausibility?
Scully: What I find fantastic is the notion that there are
answers beyond the realm of science. The answers are
there, you just have to know where to look.
Mulder: (sarcastically) That's why they put the 'I' in FBI!

"The X-Files: Pilot"