Looking at the answers provided on the question as to the best approach to effective teaching of literature, I find that most colleagues proceed by way of theory, whether post-colonialism or structuralism, new criticism and close reading, new historicism, or some other. It seems, therefore, we are all agreed on theory as an irreplaceable instrument of reading and teaching. So the question really is one of which is the most reliable instrument. So I would ask, are there theories that apply across the board to all forms and genres, without discrimination as to time and place of origin?