" Come in," he said gently. And inwardly raged at this portion of his being that rendered him helpless; that
he could not control; that lay coiled within him like a length of rope, always ready to fling itself unbidden
at the cry of someone else's need. It gave him -no peace. Not even in sleep. At the edge of his dreams,
there was often a sound like a faint, brief cry of someone in distress. It was almost inaudible in the
distance. Always the same. And for minutes after waking, he would feel the anxiety of some duty
unfulfilled. "

― William Peter Blatty , The Exorcist