Cyril O'Regan, University of Notre Dame, at Church Life Journal.
"One way of thinking of the modern demonic is that it is marked by an otherness viewed not as a threatening outside, but a shocking inside contributing to the doubling of a self that cannot find ballast and thereby becomes capable of intentional forms of evil far beyond the circumscription of the human flesh and psyche.
"Given this definition, my proposal is that the literary figure who is most penetrating and expansive on the topic is Fyodor Dostoevsky. ..."
See Dostoevsky, "White Nights" in Gateway to the Great Books (10 Vol., 1963) volume 3, and The Brothers Karamazov in Great Books of the Western World (first edition, 52 Vol., 1952) volume 52, (second edition, 60 Vol., 1990) volume 52.