This essay argues that we can only develop a proper grasp of Kant's practical philosophy if we
appreciate the central role played in his thought by the notion of the interests of reason.
While it is generally acknowledged that Kant does not regard reason as a purely instrumental
faculty but sees it as endowed with its own essential interests this book is the first to
explain how the notion of the interests of reason lies at the heart of his philosophical
project - and how it allows us to make sense of some of the most puzzling aspects of his
practical philosophy.
