The debate between moral realism and antirealism plays an important role in contemporary metaethics as well as in the interpretation of Kant’s moral philosophy. This volume aims to clarify whether, and in what sense, Kant is a moral realist, an antirealist, or something in-between. Based on an explication of the key metaethical terms, internationally recognized Kant scholars discuss the question of how Kant’s moral philosophy should be understood in this regard. All camps in the metaethical field have their inhabitants: Some contributors read Kant’s philosophy in terms of a more or less robust moral realism, objectivism, or idealism, and some of them take it to be a version of constructivism, constitutionism, or brute antirealism. In any case, all authors introduce and defend their terminology in a clear manner and argue thoughtfully and refreshingly for their positions. With contributions of Stefano Bacin, Jochen Bojanowski, Christoph Horn, Patrick Kain, Lara Ostaric, Fred Rauscher, Oliver Sensen, Elke Schmidt, Dieter Schönecker, and Melissa Zinkin.

In many histories of modern ethics, Kant is supposed to have ushered in an anti-realist or constructivist turn by holding that unless we ourselves 'author' or lay down moral norms and values for ourselves, our autonomy as agents will be threatened. In this book, Robert Stern challenges the cogency of this 'argument from autonomy', and claims that Kant never subscribed to it. Rather, it is not value realism but the apparent obligatoriness of morality that really poses a challenge to our autonomy: how can this be accounted for without taking away our freedom? The debate the book focuses on therefore concerns whether this obligatoriness should be located in ourselves (Kant), in others (Hegel) or in God (Kierkegaard). Stern traces the historical dialectic that drove the development of these respective theories, and clearly and sympathetically considers their merits and disadvantages; he concludes by arguing that the choice between them remains open.

The debate between moral realism and antirealism plays an important role in contemporary metaethics as well as in the interpretation of Kant’s moral philosophy. This volume aims to clarify whether, and in what sense, Kant is a moral realist, an antirealist, or something in-between. Based on an explication of the key metaethical terms, internationally recognized Kant scholars discuss the question of how Kant’s moral philosophy should be understood in this regard. All camps in the metaethical field have their inhabitants: Some contributors read Kant’s philosophy in terms of a more or less robust moral realism, objectivism, or idealism, and some of them take it to be a version of constructivism, constitutionism, or brute antirealism. In any case, all authors introduce and defend their terminology in a clear manner and argue thoughtfully and refreshingly for their positions. With contributions of Stefano Bacin, Jochen Bojanowski, Christoph Horn, Patrick Kain, Lara Ostaric, Fred Rauscher, Oliver Sensen, Elke Schmidt, Dieter Schönecker, and Melissa Zinkin.

Kenneth R. Westphal presents an original interpretation of Hume's and Kant's moral philosophies, the differences between which are prominent in current philosophical accounts. Westphal argues that focussing on these differences, however, occludes a decisive, shared achievement: a distinctive constructivist method to identify basic moral principles and to justify their strict objectivity, without invoking moral realism nor moral anti-realism or irrealism. Their constructivism is based on Hume's key insight that 'though the laws of justice are artificial, they are not arbitrary'. Arbitrariness in basic moral principles is avoided by starting with fundamental problems of social coördination which concern outward behaviour and physiological needs; basic principles of justice are artificial because solving those problems does not require appeal to moral realism (nor to moral anti-realism). Instead, moral cognitivism is preserved by identifying sufficient justifying reasons, which can be addressed to all parties, for the minimum sufficient legitimate principles and institutions required to provide and protect basic forms of social coördination (including verbal behaviour). Hume first develops this kind of constructivism for basic property rights and for government. Kant greatly refines Hume's construction of justice within his 'metaphysical principles of justice', whilst preserving the core model of Hume's innovative constructivism. Hume's and Kant's constructivism avoids the conventionalist and relativist tendencies latent if not explicit in contemporary forms of moral constructivism.

Morality has traditionally been understood to be tied to certain metaphysical beliefs: notably, in the freedom of human persons (to choose right or wrong courses of action), in a god (or gods) who serve(s) as judge(s) of moral character, and in an afterlife as the locus of a “final judgment” on individual behavior. Some scholars read the history of moral philosophy as a gradual disentangling of our moral commitments from such beliefs. Kant is often given an important place in their narratives, despite the fact that Kant himself asserts that some of such beliefs are necessary (necessary, at least, from the practical point of view). Many contemporary neo-Kantian moral philosophers have embraced these “disentangling” narratives or, at any rate, have minimized the connection of Kant’s practical philosophy with controversial metaphysical commitments ‐ even with Kant’s transcendental idealism. This volume re-evaluates those interpretations. It is arguably the first collection to systematically explore the metaphysical commitments central to Kant’s practical philosophy, and thus the connections between Kantian ethics, his philosophy of religion, and his epistemological claims concerning our knowledge of the supersensible.

This volume of new essays provides a comprehensive and structured examination of Kant's justification of norms, a crucial but neglected theme in Kantian practical philosophy. The essays engage with the view that a successful account of justification of normative claims has to be non-metaphysical and go on to pursue further implications in ethics, legal and political philosophy, and philosophy of religion.

The philosopher Kant is a key thinker in shaping our contemporary concept of morality, freedom, and happiness. This book argues that Kant believes in God, but that he is not a Christian, and that this opens up an important and neglected dimension of Western Philosophy.