The goal of this paper is to articulate a new solution to Kant’s third antinomy of pure reason, one that establishes the possibility ofincompatibilist freedom—the freedom presupposed by our traditional conceptions of moral responsibility, moral worth, and justice—without relying on the doctrine of transcendental idealism (TI). A discussion of Henry Allison’s “two-aspect” interpretation of Kant’s TI allows me both to criticize one of the best defenses of TI today and to advance my own TI-free solution to the third antinomy by (...) appeal to a thesis of epistemic modesty based on Paul Guyer’s realist interpretation of Kant’s theory of experience. According to this interpretation, the a priori forms of our sensibility and understanding are not forms that the mind imposes on a material whose real properties are unknowable to us but are instead forms that limit or filter the kinds of things we can experience and know. In particular, being causally determined is a real feature of things as they are in themselves, but the necessity and universality of our deterministic claims are relative, restricted to the objects of possible experience. Consequently, though a causally determined event cannot be free, the necessity and universality of determinism does not entail that free events (choices) cannot exist but that they cannot constitute objects of possible experience. After arguing that freedom is possible, I outline an argument for the reality of freedom, based on therequirements of morality. Finally, I argue that my view, though opposed to metaphysical naturalism, is consistent with scientific realism and methodological naturalism. (shrink)

: This paper discusses the function and scope of incompatibilist or transcendental freedom in Kant's moral philosophy. The prevailing view among scholars, most notably Allison, is that the function of transcendental freedom is to enable us to articulate a first-person conception of ourselves as rational agents involved in deliberation and choice. Thus, the scope of transcendental freedom is rational agency in general. In order to perform this function, freedom has to be merely conceivable. Pace Allison, I argue that our first-person (...) conception is neutral with respect to causal determinism, and that the function of transcendental freedom is to provide the metaphysical conditions of the possibility of genuine moral responsibility and perfect justice, and to get rid of moral luck. In order to perform this function, transcendental freedom has to be not just conceivable, but metaphysically real. My view suggests that we only have reason to attribute freedom to ourselves in situations in which we are aware that the moral law commands us categorically. We do not have a similar reason to believe we are free in purely prudential choices. Thus, the scope of transcendental freedom is not rational agency in general, but only moral agency. (shrink)