  Internalists have two options here. They can deny that genuine reasons for belief can be external, extending their internalism to theoretical reasons, or they can seek to motivate differential treatment of the practical and the theoretical cases. To pursue the former course, internalists might argue that we ascribe reasons for belief on the assumption of a desire for knowledge or truth (see Kelly 2003 for discussion). They can further argue that a person is simply not in the business of forming beliefs if he does not have something resembling a desire for truth (Velleman 2000). Alternatively, internalists might argue that we ascribe reasons for belief on the assumption that whatever the contents of a person’s desire-set, it will include some item that would be served by believing that for which there is evidence.