How Compatibilists Can Account for the Moral Motive: Autonomy and Metaphysical Internalism

Abstract

In Groundwork III and in the Critique of Practical Reason Kant famously asserted that “Freiheit und unbedingtes praktisches Gesetz weisen […] wechselsweise auf einander zurück.” Kant's thesis of the analyticity of freedom and practical reason was rejected by his prominent early readers. In the eighth of his influential Letters on Kant's Philosophy of 1786–1787, Karl Leonhard Reinhold argued that the identification of the will with practical reason excluded the possibility of ascribing freedom to immoral and amoral actions. Reinhold proposed that free will consequently be defined in libertarian terms, as the free capacity to satisfy one of two fundamental drives at the expense of the other: either ‘den uneigennützigen Trieb’ equivalent to Kant's ‘Triebfeder der reinen praktischen Vernunft’, or ‘den eigennützigen Trieb’ equivalent to Kant's ‘Begierde und Neigungen’ or ‘Eigenliebe’. Most first-generation commentators followed Reinhold in rejecting Kant's assertion of an analytical relationship between freedom and practical reason, but several came out on the other side, denying freedom in order to secure the identity of will and practical reason. Leonhard Creuzer thus concurred with Reinhold that immoral conduct could not be imputed to the causality of pure reason, or by extension, to the rational agent, but then developed a theory of “transcendental fatalism” according to which immoral actions were the effects of forces from the realm of nature intervening upon, and outweighing, the force of the intelligible ground. Nearly a century later, Hermann Cohen dismissed libertarian freedom as incoherent in itself and as incompatible with autonomy. Across the channel Henry Sidgwick withheld judgment on the coherence of libertarian freedom, but he, too, claimed that such freedom is, at all events, incompatible with the causality of practical reason. More recently, Gerold Prauss has suggested that the perennial difficulties posed by Kant's account of the relationship between freedom and practical reason might be resolved by construing the relationship as a synthetic rather than analytic one. This view has found supporters across the Atlantic.