 One important question is whether morality requires the sort of freedom Kant has in mind. Hume would deny that it does, but this is partly because his view of morality itself is so different from Kant’s. The issue here is not just about free will. It is about which conception of morality is most plausible. If Kant has convincing grounds for insisting on the unique nature of moral obligation or judgments of “moral worth”, this puts some pressure on Hume to take Kant’s notion of free will more seriously. Another important question is how to interpret Kant’s actual position, which is the subject of controversy. Standard textbooks classify Kant as a libertarian (incompatibilist) about free will, but those who study Kant most intensively often disagree about the nature of his view. Some argue that Kant offers a form of incompatibilism (e.g., Pereboom 2006; Allison 1990; Watkins 2005), while others maintain that he is some sort of compatibilist, however unorthodox (e.g., Bennett 1984; Hudson 1994). According to one influential interpretation, Kant endorses “not only the compatibility of freedom and determinism, but also the compatibility of compatibilism and incompatibilism” (Wood 1984: 74). These scholarly debates bear on the question of how Kant’s view compares to Hume’s, as does the question of whether the naturalist or traditional interpretation best captures Hume’s own position. Finally, when comparing Kant and Hume on the question of freedom, one must recognize that there is a modest and skeptical side to Kant’s view that Hume would applaud. For Kant, free will is an “inscrutable faculty” (CPrR 5:47), whose operations lie beyond the reach of human cognition. It is impossible to know whether we actually have free will (CPrR 5:72; G 4:459). Indeed, Kant’s significant debt to Hume is evident in the former’s claim that “all human insight is at an end as soon as we have arrived at basic powers or basic faculties” (CPrR 5:46). Here we find profound agreement between the two philosophers about the limits of human insight.