The Form of Practical Knowledge: A Study of the Categorical Imperative

Immanuel Kant’s claim that the categorical imperative of morality is based in practical reason has long been a source of puzzlement and doubt, even for sympathetic interpreters. Kant’s own explanations, which mainly concern his often-criticized formula of universal law, are laconic and obscure, leading interpreters to dismiss them in favor of less ambitious claims involving his other famous formulas.

In The Form of Practical Knowledge, Stephen Engstrom provides an illuminating new interpreta...