" Fiction cannot move so much, but that the attention may be easily transferred; and though it must be allowed that pleasing melancholy be sometimes interrupted by unwelcome levity, yet let it be considered likewise, that melancholy is often not pleasing, and that the disturbance of one man may be the relief of another; that different auditors have different habitudes; and that, upon the whole, all pleasure consists in variety. "

― Samuel Johnson , Preface to Shakespeare