 One argument in favor of the Humean picture alleges that if beliefs were sufficient to motivate, then we would expect people with the same beliefs to be motivated in the same way. In fact, however, whereas some people are motivated by their moral belief, say, that contributing to famine relief is a duty, to write a check to Oxfam, others feel no such inclination whatsoever. But anti-Humeans claim that they can explain away these differences by showing either that differential motivation is in fact due to other differences in belief or to motives that compete with and override the desires generated by moral beliefs (Shafer-Landau 2003, 129–130). 