Kant's Impure Ethics: From Rational Beings to Human Beings (review)

Kant's Impure Ethics sounds like the title of a very short book. Kant, strenuous advocate of purging everything empirical from moral theory in order to reveal the pure moral law a priori, is assumed by many to reject impure ethics. Louden sets out to correct that image of Kant. Not only does Kant offer some impure, by which Louden means [End Page 300] empirical, ethics, Kant requires it in order for his moral system to work. Louden argues that impure ethics is an integral part of Kant's ethical project. Since as rational beings human beings are obligated to create a realm of ends, they need to be shown the specific manner in which they can create this moral realm in the specific world they inhabit. This impure ethics is never more than an application of the pure ethics and is not itself the source of any moral norms; Kant does not study human nature in order to establish or justify moral principles. Nor is impure ethics a sharpening of general duties to interpret them for our particular species or even groups within the species; Kant is not arguing that women or the French have duties peculiar to them. Rather impure ethics concerns the manner in which human beings can make morality efficacious in human life. Empirical knowledge of human beings can help determine the proper paths for humans to take in creating the realm of ends. Louden insists, as do some other recent commentators, that it is misleading to view the categorical imperative in isolation. Instead, Kant intended the categorical imperative to be understood in light of the development of a virtuous character. In its broadest sense the impure ethics concerns how all humans can develop that virtuous character.