Abstract

This study aims to develop and defend an account of practical rationality and intention that explains how weakness of the will is conceptually possible. I first present two sceptical arguments against the possibility of weakness and then distinguish two different responses to scepticism that defends its possibility. Both sceptical arguments are motivated by what many have believed is an analogy between theoretical and practical reasoning. This analogy holds that the conclusion of practical reasoning is an intention just as the conclusion of theoretical reasoning is a belief. The particular version held by what I call the Socratic theorists claims, in addition, that the value of desirability is transferred from premisses to conclusion in practical reasoning, just as probability is transferred from premisses to conclusion in theoretical reasoning. One example of an author who takes the analogy as a basic premise and seek to explain how weakness of the will still may be possible, is Donald Davidson. Critics of Davidson object that the the kinds of difficulties that his account runs into shows that the Socratic version of the analogy must be false; not only is this account phenomenologically implausible, it also exaggerates the degree of irrationality of the weak agent. In this study I suggest the possibility of a weaker version of the Davidsonian account. The main source of difficulty for the Davidsonian account, I argue, may not be its reliance on the Socratic version of the analogy between practical and theoretical reasoning, but rather its particular understanding of this analogy in terms of an analogy between practical and inductive-statistical reasoning. This understanding may lead one to accept too “rationalistic” a picture of the reasoning processes behind weakness of the will which, in effect, may make the account vulnerable to objections that it is phenomenologically implausible and exaggerates the irrationality of the weak agent. The weaker version of the Davidsonian account that I propose, ties in the account of weakness with the notions of “satisficing” and “default reasoning”. Although it preserves the central idea of the stronger version that intentions are unconditional evaluative judgements, it proposes a different view of the contents of these judgements, as well as of the reasoning process that lie behind them. It is not difficult to motivate this weaker view: given our human finitary predicament, both satisficing and default reasoning seem to be likely results of an optimal trade-off between the speed and reliability of our computational processes. The question is how these notions may shape the concepts we use to understand weakness of the will. I argue that if we modify the account usually ascribed to Davidson in the light of these notions, the result is a less rationalistic picture of weakness of the will. The gains are more phenomenological credibility as well as a less extreme view of the degree of irrationality involved.