We think of ourselves as having reasons for action. But what is it about us as rational agents, about our rationality or our being rational agents, such that we have reasons for action? How are we motivated by a consideration in a manner that nonrational animals are incapable of? The most common answer, that our ability to form desires enables our having reasons for action, is problematic in a number of ways; instead, our ability to form beliefs about value provides the correct account. From this it follows that there are few motivational restrictions on what can be a reason for action for a...