Along with Descartes, Kant is the leading author of modernity: his influence in science, morality, politics and aesthetics is considerable. A large number of ethical dilemmas (biology, medicine, etc.) today refer to Kantian thought. Knowing his philosophy appears to be an imperative to orient oneself through the major questions that innervate our modernity. This book thus exposes the salient features of Kantian reflection and offers an interpretation of it, breaking with the cliché of a humanist Kant placing man above everything. He defends the idea that man is one of the most imperfect samples of the true object of Kantian thought, namely the reasonable being in general.