This book is available either individually, or as part of the specially-priced Arguments of the Philosphers Collection.

First Published in 1999. The purpose of this series is to provide a contemporary assessment and history of the entire course of philosophical thought. Each book constitutes a detailed, critical introduction to the work of a philosopher of major influence and significance. Any list of the great philosophers has to include Kant. His influence on philosophical thinking in the nineteenth and twentieth centuries has been immense, and his work remains of the most immediate contemporary relevance.

Kant held the moral law to be an objective imperative, an entity in its own right. It carries with it prescriptive force, in parallel to other principles of pure reason, like those of logic and mathematics. Objective imperatives therefore do not derive their authority from any other source, such as common consensus or the will of God. In Objective Imperatives, Ralph C. S. Walker seeks to show that this is a highly defensible view: Kant's Categorical Imperative, properly understood, is broadly right. The key to it is rationality, and not universality, which functions only as an approximate test. Often, Kant sets the matter out badly, and most of the common objections to him can be shown to be due to misunderstandings. A morality that gives us an objective imperative does appear incompatible with the determinism to which Kant commits himself, but Walker argues that this appearance is misleading.