It seems to many that moral opinions must make a difference to what we’re motivated to do, at least in suitable conditions. To others, it seems that it is possible to have genuine moral opinions that make no motivational difference. Both sides – internalists and externalists about moral motivation – can tell persuasive stories of actual and hypothetical cases. Both sides can also offer a plausible deeper rationale for their picture of moral motivation. Internalists appeal to the distinctive practicality of morality, without which the practice of judging would seem to lack a point. Externalists emphasize the many belief-like features of moral judgment and the motivational inertness of belief, offering an explanation of practicality in terms ...