  Williams is concerned with what the agent comes to believe when he comes to believe that some consideration R is a reason for him to do A. Granted the conceptual premise, an ‘internal reasons statement’ is a claim that some consideration is an explanation of why by virtue of the contents of the agent’s actual ‘motivational set’ he would be motivated to do A under the conditions of sound deliberation, while an ‘external reasons statement’ is a claim that some consideration is an explanation of why independently of the contents of the agent’s actual motivational set he would be motivated to do A under those conditions.