It is well known that Kant uses the notion of the holy will in theGroundworkso as to contrast it with the finite wills of human beings. It is less clear, however, what function this contrast is supposed to perform. I argue that one role of the holy will is to illustrate transcendental idealism’s account of the relation between moral knowledge and moral practice. The position is one intended to negotiate between ostensibly competing traditions. Kant uses the holy will as a (...) way of endorsing the metaphysical picture of the scholastic tradition’s so-called ‘ethics of freedom’, whereby the ideal of moral perfection is conceived as the perfection of one’s power of freedom to the point where one is constitutively incapable of immoral action. This position is married however with the claim that the holy will’s inaccessibility to human cognition motivates a subject-oriented moral epistemology more usually associated with Enlightenment humanism. I conclude by claiming that the nuanced role for the holy will can be understood as part of Kant’s expansion of the value of religious faith [Glaube] to the domain of practical inquiry in general. (shrink)