Relative Ideas Revisited: A Reply to Thomas

158. RELATIVE IDEAS REVISITED: A REPLY TO THOMAS In "Hume's Relative Ideas" I argued that what Hume called a "relative idea" is the cognitive analogue of a definite description, that relative ideas are nonimagistic, and that recognizing the distinction between positive ideas (images) and relative ideas sheds light on various issues that remain opaque apart from that distinction. Thomas has recently taken exception to my position, contending that I have "produced a 2 theory without application in Hume's framework." In reply I shall present the three cornerstones of my view and then turn to Thomas's criticisms. I. On Relative Ideas 1.What relative ideas are: In claiming that a relative idea is the cognitive analogue of a definite description, I mean only that a relative idea functions in the cognitive realm (realm of ideas) in the same way that a definite description functions in the linguistic realm. Just as the statement expressing the contextual definition of a definite description specifies the truth conditions for a statement containing that description, the statement expressing the contextual definition of a definite description corresponding to a relative idea indicates the (factual) conditions that must obtain if that relative idea succeeds in singling out an entity, i.e. , it specifies the "truth conditions" for a relative idea (see T 448, T 458, and T 84 for Hume's use of 'truth') . 2.The intellectual milieu: The expressions 'relative idea' and 'relative notion' seem to have at least two uses in eighteenth century philosophy. Some philosophers used such expressions to refer to an idea 4 or a conception of a relation. Nonetheless, since no 159. substance theorist held that a substance is a relation, this can hardly be the sense in which Locke used the expression when he claimed that one has an "obscure and relative idea of substance in general." Further, Locke's discussion of the relationship between positive ideas (images) and the relative idea of substance clearly indicates that relative ideas provide an indirect means of allowing one to know what something is on the basis of its relation to something known directly, i.e. , on the basis of its relation to a C positive idea. Locke also claimed that one's idea of 7 infinity is a relative idea, he seems to have held that the idea of power is a relative idea, and given his account of perception, it is at least reasonable to suggest that relative ideas are found in perceptual contexts. Similarly, Berkeley maintained that one has a relative notion of immaterial substance, but no relative notion of material substance, since in the former case, but not in the latter, one has a notion 9 of the relation between: a substance and its attributes. Outside the "way of ideas" one finds the distinction between direct and relative "conception" clearly spelled out in Reid' s Essays on the Active Powers of the Human Mind. Reid wrote: Of some things, we know what they are in themselves; our conception of such things I call direct. Of other things, we do not know what they are in themselves , but only that they have certain properties or attributes, or certain relations to other things; of these our conception is only relative. 10 Reid contended that our conceptions of mind, of body, of powers, and of secondary qualities are relative conceptions , that at least some of our conceptions of large numbers of things and of polygons are relative conceptions , and that relative conceptions are operative in memory. Now given that there seems to have been a fairly 160. widely recognized doctrine of relative conception in the eighteenth century, given that the contexts in which Hume used the term 'relative idea' are contexts in which proponents of relative conception employed that term, and given that Hume stated philosophical issues in terms of the conceptual system of his time, I consider it reasonable to suggest that Hume recognized and held a doctrine of relative conception even though he did not devote so much as a paragraph to stating that doctrine. 3. The relation of images to relative ideas: A relative idea is inherently complex: it includes a positive idea (or ideas) and a relation...