" The psychiatrist grew weary; found himself drifting into private sorrow. He glanced at a plaque that someone had given him the previous Christmas. MY BROTHER HURTS. I SHARE HIS PAIN. I MEET GOD IN HIM, he read. A failed encounter. He blamed himself. He had mapped the streets of his brother's torment, yet never had walked them; or so he believed. He thought that the pain which he felt was his own. "

― William Peter Blatty , The Exorcist