Abstract

An ancient but central divide in moral philosophy concerns the nature of opinions about what is morally wrong or what our moralduties are. Some philosophers argue that moral motivation is internal to moral opinions: that moral opinions consist of motivationalstates such as desires or emotions. This has often been seen as athreat to the possibility of rational argument and justification inmorals. Other philosophers argue that moral motivation is external to moral opinion: moral opinions should be seen as beliefs about moral reality, beliefs which may or may not motivate depending onwhether the person holding them cares about moral matters. In this essay it is argued that although the traditional case forthe internalist position fails, the total available evidence andmethodological considerations support an internalist theory formu-lated in terms of a relatively rich psychological model. It is shown how such a theory can explain not only the practical character of moral opinions and their connection to moral emotions but alsophenomena that have been taken to suggest an externalist picture,such as the role of inference, inconsistency, argument and explanations in moral discussion, as well as cases of amoralism and psychological disturbance. In the end, it is concluded that externalistexplanations of the same phenomena are methodologically inferiorfor postulating a more complicated psychology.