  The phrase “nothing positive in things” means perhaps that an observer of people would find that ‘good’ and ‘evil’, as people use them are two place predicates rather than one place predicates. If Martha calls music evil, then, what that indicates to one who knows about the human use of these terms is that the music is evil to Martha. Moreover, since the same music can be good or evil for different people, or for people in different states, the two-place predication reveals more about Martha than about the music. It must be some fact about the person, rather than some fact about the thing called good or evil, that is of central importance to the understanding of the label.