Any given man sees only a tiny portion of the total truth, and very often, in fact almost … Weh! steck’ ich in dem Kerker noch? Verfluchtes dumpfes Mauerloch, Wo selbst das liebe Himmelslicht Trüb durch gemalte Scheiben bricht! Beschränkt mit diesem Bücherhauf, Den Würme nagen, Staub bedeckt, Den bis ans hohe. … perpetually, he deliberately deceives himself about that little precious fragment as well. A portion of him turns against him and acts like another person, defeating him from inside. A man inside a man. Which is no man at all.

Philip K Dick, A Scanner Darkly [Amazon, Bookshop, Publisher, Local Library]