Online research in philosophy

The Euro-American philosophical traditions offer two extreme positions to the problem of identity over time: G. W. Leibniz' essentialism and Derek Parfit's reductionism. A third alternative conception of personal identity is presented here, more appropriately named personal nonduality, which is based on Nishida Kitarō's conception of personal unity as nonrelative contradictory self-identity.

The publication of Derek Parfit's Reasons and Persons in 1984 revived and reshaped the debate on personal identity in Western philosophy. Not only does Parfit argue forcefully and ingeniously for a revisionary Reductionist theory of persons and their diachronic identity, but he also draws radical normative inferences from such a theory. Along the way he also mentions Indian Buddhist parallels to his own Reductionist theory. Some of these parallels are explored here, while particular attention is also paid to the supposed normative implications of Reductionism.

Abstract In Reasons and Persons, Derek Parfit argues that personal identity is indeterminate and that identity is not what matters in personal survival. Parfit argues that traditional views of personal identity have counterintuitive consequences and that they violate a plausible requirement, suggested by Bernard Williams, that must be met by any acceptable criterion of identity. Parfit argues that, unlike traditional determinate views of personal identity, his view succeeds in accommodating intuitions and in meeting (an analogue to) Williams' requirement. I argue that Parfit's view has more counterintuitive consequences than do the traditional views of identity. Though the traditional views do seem to violate Williams' requirement, Parfit's view fares no better. In fact, it seems that any theory of personal survival that appeals to connections that may hold to a greater or lesser extent will fail to meet the relevant requirement. This is an important general point, since the requirement is a plausible one.

Parfit’s well known book, Reasons and Persons, argues, among other things, that ‘what matters’ in regard to ‘survival’ is not personal identity but something he calls ‘relation R.’ On this basis, plus other considerations, he rejects the ‘Self-interest’ theory as to what should be our aim in life. Here I show, or try to show, that his over-all argument is seriously defective. In particular, he fails to prove that personal identity is not what matters for survival.

Parfit's most controversial claim about personal identity is that personal identity does not matter in the way we uncritically think it does) I would like to analyze Parfit's reasons for making this claim. These reasons are complex, and they stand in some tension with one another. I would like to examine them carefully and to try to arrive at the strongest case that can be made for Parfit's controversial claim about what matters.

This paper's ?I examines Derek Parfit's main, metaphysical, argument for reductionism about personal identity. ?II considers three possible ethical arguments for reductionism, and suggests a new approach to the question of what matters about personal identity which has to do with the notion of an ethical narrative.