Stability and Justification in Hume's Treatise (review)

As is well known, in the last year of his life, Hume repudiated his Treatise of Human Nature in an Advertisement that he had placed at the front of the volume of his writings containing his mature philosophical works. He asked that only the two Enquiries and other later philosophical writings be regarded as the source of "his philosophical sentiments and principles." But not leaving it at that, he admitted that there were "negligences in his . . . reasoning" and in his manner of expressing himself in the Treatise. More than twenty years earlier, Hume had admitted that publishing the Treatise in its imperfect state in his youth constituted "a very great Mistake in Conduct." But he did not have sufficient foresight to see that the admission he made in his old age constituted at least as bad an indiscretion of the same kind. Acknowledging mistakes in reasoning and in expression for a philosopher is like waving a red flag in front of a bull. Two bulls in fact: the philosopher and the "reconstructive" historian of philosophy. The former is given ample work in correcting the older philosopher's mistakes; the latter in devising an interpretation of a text that apparently leaves itself open to many. Hence the immense popularity that Hume's Treatise of Human Nature has enjoyed in the two and a half centuries since he asked that it be disregarded. Who cares about "his philosophical sentiments and principles" anyway?

Louis Loeb's study of epistemology in Hume's Treatise is both an exercise in "reconstructive history of philosophy" and a philosophical emendation of Hume's (reconstructed) "philosophical system." The first task is pursued in the first five chapters of the book; the second in the last two. "Reconstructive history" as practiced by Loeb does not try to provide "a balanced commentary" but rather "an illuminating and fruitful interpretive perspective" (viii) on what a philosopher has written. Loeb's perspective on Hume's epistemology is derived from details of Hume's psychology of the imagination developed mainly in sections 9-13 of part 3 of book 1, details which Hume himself considered "unnecessary" to the exposition of his mature epistemology in the first Enquiry. Loeb's philosophical emendations derive from his claim that Hume made certain mistakes which led him to despair of the success of his project and settle for sceptical conclusions in part 4. In the last two chapters of the book Loeb seeks to save Hume from his own sceptical conclusions.

Loeb regards his account as a development and correction of the kind of naturalistic interpretation of Hume's epistemology that was originally developed by Norman Kemp Smith (21). A naturalistic theory of justification, according to Loeb, is one that grounds beliefs that one already considers to be justified in the psychological mechanisms that generate them. Whereas Kemp Smith argued that justification depends on the "irresistibility" or "inevitability" of the beliefs, Loeb holds that justification depends upon what he calls the "stability" of the belief generating mechanisms. A belief forming mechanism is stable just in case it produces a consistent set of beliefs that will stand up even under "reflection." For example, in part 3 of book 1 (81, 159, 238), Hume presents beliefs based on cause and effect as stable in this sense, and contrasts them with "unphilosophical" belief forming mechanisms such as indoctrination (education). Unlike the former, the latter mechanism generates beliefs that "are frequently contrary . . . to themselves in different times and places and is never on that account recognized by philosophers" (Treatise117). Furthermore, we have a positive motivation to accept stable mechanisms in that they produce ease or relief from psychological tension. Loeb links this goal both with the ancient Pyrrhonian quest for ataraxia (6-9) and with Hume's moral theory, where he seeks a general point of view as a relief from...