Perry argues that certain sorts of indexicals are 'essential', in the sense that they cannot be eliminated in favor of descriptions. This paper also introduces the influential idea that certain sorts of indexicals play a special role in thought, and have a special connection to action.

This valuable and interesting book attempts to discern the essential Freudian theses about the mind and to give them a cogent philosophical defense. Like many philosophers Gardner sees psychoanalytic explanation as continuous with folk psychology, though he holds that the latter needs considerable expansion in order to accommodate irrationality of the “Freudian” sorts.