The paper constitutes a detailed critical commentary on Stephen Darwall’s Impartial Reason (Ithaca: Cornell University Press, 1983). Its central thesis is that Darwall’s attempt to integrate a naturalist theory of substantive reasons for acting with a neo-rationalist derivation of moral requirements from the very concept of practical rationality is faced with insurmountable theoretic problems. The author argues that anyone who would accept a plausible internalist account of reasons, that justificatory reasons for an agent to act are facts which must be (...) capable of motivating that agent under certain conditions, cannot establish on an a priori or rationalist basis claims for the intersubjective validity of reasons or substantive normative requirements of any kind, but rather must acknowledge that such claims are both irreducibly empirical and epistemically risky. (shrink)

The paper constitutes a detailed critical commentary on Stephen Darwall’s Impartial Reason. Its central thesis is that Darwall’s attempt to integrate a naturalist theory of substantive reasons for acting with a neo-rationalist derivation of moral requirements from the very concept of practical rationality is faced with insurmountable theoretic problems. The author argues that anyone who would accept a plausible internalist account of reasons, that justificatory reasons for an agent to act are facts which must be capable of motivating that agent (...) under certain conditions, cannot establish on an a priori or rationalist basis claims for the intersubjective validity of reasons or substantive normative requirements of any kind, but rather must acknowledge that such claims are both irreducibly empirical and epistemically risky. (shrink)

This paper treats two problem cases in decision theory, the Newcomb problem and Reed Richter''s Button III. Although I argue that, contrary to Richter, the latter case does not constitute a genuine counterexample to a standard general proposition of (causal) decision theory, I agree with and undertake to amplify his solution to the decision problem in Button III. I then apply the conclusions and distinctions in the foregoing treatment of Button III to the Newcomb problem and argue that a familiar (...) version of the dominance argument for taking both boxes runs afoul of plausible general constraints on rational agency. The underlying theme of the paper is that basic considerations of epistemic coherence play an important role in dealing with problem cases in decision theory. (shrink)