One of my favorites!
5.17 All Souls
MULDER: By who? Scully, I think you’re the one who’s being misled. Not just willingly, but willfully. I’ve never seen you more vulnerable or susceptible or more easily manipulated and it scares me because I don’t know why.
SCULLY: I saw Emily. She came to me in a vision.
MULDER: I think you should step away. Personal issues are making you lose your objectivity, clouding your judgment.