Abstract

Kant's well-known statement from the “Critique of Practical Reason” (§ 7) that the consciousness of the basic law of pure practical reason (or the customary/moral law) can be called a fact of reason (V, 31.24) has not yet become the subject of adequate attention of domestic researchers. In the “Critique of Practical Reason”, Kant justify his famous categorical imperative by appealing to the “fact of reason” (§ 7). A closer reading of this passage reveals that it refers to a “fundamental law of pure practical reason” and its “consciousness” is called “a fact of reason”. It is likely to think that Kant makes a “naturalistic fallacy” when he tries to justify “ought” (law) from “is” (fact). An analysis of the broader context of the use of the term “fact”, which occurs in the Critique in general 11 times, proves that its denotation is a moral law, which is explained in the corresponding train of thought. A special problem of interpretation is the explanation of the genitive in the expression “a fact of reason” [ein Factum der Vernunft]. It is common to read it as genitivus subjectivus (the fact is a product (act) of the reason, the fact arises thanks to the reason) and as genitivus objectivus (the reason itself is a fact, something factual). But from the standpoint of modern studies of Kant its reading as genitivus auctoris (Willaschek, Wolff, Noller) is promising. Kant’s specific use of the Latin form “ein Factum” in other works, which has the meaning not of “fact”, but of “imputable act” also, testifies in favor of this. Starting with Dieter Heinrich’s article “The Concept of Moral Insight and Kant’s Doctrine of the Fact of Reason” (1960), many researchers interpret the thesis of the “fact of reason” as Kant’s rejection of the attempt at the deduction of moral insight in the “Groundwork of the Metaphysics of Moral” (1785). However, as modern studies (Riedel, Wolff) show, this interpretation is not convincing enough. There are sufficient reasons to believe that it is Kant’s moral and legal doctrine of imputatio facti can explicate an enigmatic passage of the II Critique.