Father Damien Karras: There's not a day in my life that I don't feel like a fraud. Other priests, doctors, lawyers - I talk to them all. I don't know anyone who hasn't felt that.
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Regan MacNeil: Oh please, Mother, make it stop! It's hurting.
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Karras: You'd like that?
Regan: Intensely.
Karras: But wouldn't that drive you out of Regan?
Regan: It would bring us together.
Karras: You and Regan.
Regan: You and us.
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Lt. Kinderman: If certain British doctors never asked "What is this fungus?" we wouldn't today have penicillin, correct?
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Karras: Why her? Why this girl?
Merrin: I think the point is to make us despair. To see ourselves as... animal and ugly. To make us reject the possibility that God could love us.