Kants Kritik der praktischen Vernunft (1788) steht zu Unrecht oft im Schatten der Kritik der reinen Vernunft und der Grundlegung zur Metaphysik der Sitten. Tatsächlich sind die Grundelemente der Kantischen Moralphilosophie im Gegensatz zu vielen Thesen der ersten Kritik bis heute weitgehend anerkannt, und erst der Nachweis der zweiten Kritik, dass Freiheit wirklich ist, macht "den Schlussstein von dem ganzen Gebäude eines Systems der reinen, selbst der spekulativen Vernunft aus". Entlang der Stichworte reiner Wille, gesetzgebende Form der Maxime, transzendentale Freiheit, (...) Autonomie und Faktum der Vernunft zeigt Kant in der "Analytik", dass reine Vernunft "für sich" praktisch sein, nämlich den Willen bestimmen kann. Die "Dialektik" sichert den Ideen von der Existenz Gottes und der Unsterblichkeit der Seele objektive Realität und untersucht das Verhältnis von theoretischer und praktischer Vernunft. Die "Methodenlehre" schließlich skizziert eine Theorie moralischer Erziehung, die für den heutigen Ethikunterricht noch aktuell ist. Die zwölf Beiträge dieses kooperativen Kommentars, der anlässlich des 300. Jubiläums Immanuel Kants in einer 3., überarbeiteten Auflage erscheint, rekonstruieren die Argumente eines Schlüsseltextes der Moralphilosophie und prüfen die sachliche Überzeugungskraft. Mit Beiträgen von: Karl Ameriks, Reinhard Brandt, Eckart Förster, Otfried Höffe Allen W. Wood Christoph Horn, G. Felicitas Munzel, Onora O'Neill Annemarie Pieper, Friedo Ricken, Nico Scarano. (shrink)

Immanuel Kant (1724–1804) argued that moral requirements are based on a standard of rationality he dubbed the “Categorical Imperative” (CI). Immorality thus involves a violation of the CI and is thereby irrational. Other philosophers, such as Locke and Hobbes, had also argued that moral requirements are based on standards of rationality. However, these standards were either desirebased instrumental principles of rationality or based on sui generis rational intuitions. Kant agreed with many of his predecessors that an analysis of practical reason (...) will reveal only the requirement that rational agents must conform to instrumental principles. Yet he argued that conformity to the CI (a non-instrumental principle) and hence to moral requirements themselves, can nevertheless be shown to be essential to rational agency. This argument was based on his striking doctrine that a rational will must be regarded as autonomous, or free in the sense of being the author of the law that binds it. The fundamental principle of morality — the CI — is none other than the law of an autonomous will. Thus, at the heart of Kant's moral philosophy is a conception of reason whose reach in practical affairs goes well beyond that of a Humean ‘slave’ to the passions. Moreover, it is the presence of this self-governing reason in each person that Kant thought offered decisive grounds for viewing each as possessed of equal worth and deserving of equal respect. (shrink)

This paper addresses the issue of making sense of Kant’s notion of moral worth. Kant’s identification in GMM1 I of the good will as the unconditional good leads to understanding the moral worth of human agency in ways which, some critics claim, is at odds with our moral intuitions. By first focusing upon how Kant singles out action out of duty as characteristic of the good will, we shall show that a covert assumption about our nature potentially weakens the force (...) of Kant’s argument. This paper claims that this assumption is not needed, and proposes an interpretation of Kant’s notion of moral worth that dispenses with it. In so doing, the interpretative strategy draws upon Kant’s solution to the Third Antinomy, and therefore on Transcendental Idealism. An analysis of the moral worth of the action of a benevolent agent who heeds the requirements of duty will show how inclinations contribute to morally worthy action, while the action’s moral worth lies in its being motivated by duty. A further analysis of the issue of moral worth in the light of recent scholarship introduces a distinction between the moral worth of the action and of the agent. This provides the material to address an important standard criticism of Kantian ethics. The paper concludes by suggesting that the proposed interpretation is required to make proper sense of Kant’s indirect duty to develop compassionate inclinations. (shrink)