  Third, the entry assumes that moral knowledge entails (roughly) justified true moral belief. This assumption commits me to the position that moral knowledge is incompatible with non-cognitivism (the view that moral claims lack cognitive value, such as truth-value). A non-cognitivist, however, may seek to explain how the attitudes or prescriptions expressed in moral claims are justified. (See Hare 1981, Campbell 1985, Gibbard 1990, and Blackburn 1998 for theories of moral justification compatible with non-cognitivism and the entry on  moral skepticism  for a discussion of moral justification in general.) Indeed, an expressivist may invoke a deflationary conception of truth to support the idea that we can speak of justified moral beliefs that are “true” — without implying that justified moral beliefs accurately represent moral reality. Moral justification is discussed below, however, only as it pertains to putatively reliable representations of moral reality.