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“What’s the point?” “Who can know?” answered Merrin. “Who can really hope to know? And yet I think the demon’s target is not the possessed; it is us … the observers … every person in this house. And I think—I think the point is to make us despair; to reject our own humanity, Damien: to see ourselves as ultimately bestial, vile and putrescent; without dignity; ugly; unworthy. And there lies the heart of it, perhaps: in unworthiness. For I think belief in God is not a matter of reason at all; I think it finally is a matter of love: of accepting the possibility that God could ever love us.” Merrin paused, then continued more slowly and with an air of introspection: “Again, who really knows. But it is clear—at least to me—that the demon knows where to strike. Oh, yes, he knows. Long ago I despaired of ever loving my neighbor. Certain people … repelled me. And so how could I love them? I thought. It tormented me, Damien; it led me to despair of myself and from that, very soon, to despair of my God. My faith was shattered.” Surprised, Karras turned and looked at Merrin with interest. “And what happened?” he asked. “Ah, well … at last I realized that God would never ask of me that which I know to be psychologically impossible; that the love which He asked was in my will and not meant to be felt as emotion. No. Not at all. He was asking that I act with love; that I do unto others; and that I should do it unto those who repelled me, I believe, was a greater act of love than any other.” Merrin lowered his head and spoke even more softly. “I know that all of this must seem very obvious to you, Damien. I know. But at the time I could not see it. Strange blindness. How many husbands and wives,” Merrin uttered sadly, “must believe they have fallen out of love because their hearts no longer race at the sight of their beloveds. Ah, dear God!” He shook his head. And then he nodded. “There it lies, I think, Damien … possession; not in wars, as some tend to believe; not so much; and very rarely in extraordinary interventions such as here … this girl … this poor child. No, I tend to see possession most often in the little things, Damien: in the senseless, petty spites and misunderstandings; the cruel and cutting word that leaps unbidden to the tongue between friends. Between lovers. Between husbands and wives. Enough of these and we have no need of Satan to manage our wars; these we manage for ourselves … for ourselves.”
― William Peter Blatty, The Exorcist