The book offers a definitive study of the development of Kant's conception of the highest good, from his earliest work, to his dying days. Insole argues that Kant believes in God, but that Kant is not a Christian, and that this opens up an important and neglected dimension of Western Philosophy. Kant is not a Christian, because he cannot accept Christianity's traditional claims about the relationship between divine action, grace, human freedom and happiness. Christian theologians who continue to affirm these traditional claims (and many do), therefore have grounds to be suspicious of Kant as an interpreter of Christian doctrine. As well as setting out a theological critique of Kant, Insole offers a new defence of the power, beauty, and internal coherence of Kant's non-Christian philosophical religiosity, 'within the limits of reason alone', which reason itself has some divine features. This neglected strand of philosophical religiosity deserves to be engaged with by both philosophers, and theologians. The Kant revealed in this book reminds us of a perennial task of philosophy, going back to Plato, where philosophy is construed as a way of life, oriented towards happiness, achieved through a properly expansive conception of reason and happiness. When we understand this philosophical religiosity, many standard 'problems' in the interpretation of Kant can be seen in a new light, and resolved. Kant witnesses to a strand of philosophy that leans into the category of the divine, at the edges of what we can say about reason, freedom, autonomy, and happiness.

Chris L. Firestone and Nathan Jacobs integrate and interpret the work of leading Kant scholars to come to a new and deeper understanding of Kant's difficult book, Religion within the Boundaries of Mere Reason. In this text, Kant's vocabulary and language are especially tortured and convoluted. Readers have often lost sight of the thinker's deep ties to Christianity and questioned the viability of the work as serious philosophy of religion. Firestone and Jacobs provide strong and cogent grounds for taking Kant's religion seriously and defend him against the charges of incoherence. In their reading, Christian essentials are incorporated into the confines of reason, and they argue that Kant establishes a rational religious faith in accord with religious conviction as it is elaborated in his mature philosophy. For readers at all levels, this book articulates a way to ground religion and theology in a fully fledged defense of Religion which is linked to the larger corpus of Kant's philosophical enterprise.

Kant on Freedom and Rational Agency provides a novel interpretation and rational reconstruction of Kant's doctrine of freedom. Markus Kohl shows how Kant defends the belief that we are free from foreign (natural and super-natural) causes as a presupposition of all meaningful human activity. While this interpretation focuses on the essential role that freedom of will plays in our moral agency, it also examines how our status as rational cognitive agents hinges on our freedom of thought, and why our aesthetic engagement with beauty requires our freedom of imagination. Kohl thereby gives a compelling sense of Kant's estimation that freedom is a "cardinal point"--even the "keystone"--of his entire critical philosophy. Kant's doctrine of freedom emerges in this account as a systematic critique of a naturalistic worldview which regards all our capacities, representations, and actions as the causal upshot of natural laws and forces. Kant holds that the naturalistic worldview fatally undermines our self-conception as rational agents. This critique of naturalism culminates in the argument that naturalistic cognizers cannot explain away our freedom from natural forces because they must presuppose such a freedom in their own cognitive efforts to devise rationally valid naturalistic theories.

The contributions of leading Kantian and Kierkegaardian scholars to this collection break down to the simplistic contrast in which Kant is seen as the advocate of a rational moral theology and Kierkegaard as the advocate of an irrationalist faith. This collection is an ideal text for discussion of central issues.

Kant is a key thinker in the emergence of our contemporary sense of what 'human freedom' is, and why it is important. This book shows that important features of Kant's philosophy were forged out of difficulties he had in reconciling his belief in God as creator with the concept of human freedom.

The notion of the highest good used to occupy a primary role in ethical theorising, but has largely disappeared from the contemporary landscape. The notion was central to both Aristotle's and Kant's ethical theories, however--a surprising observation given that their approaches to ethics are commonly conceived as being diametrically opposed. The essays in this collection provide a comprehensive treatment of the highest good in Aristotle and Kant and show that, even though there are important differences in terms of content, there are also important similarities in terms of the structural features of Aristotle's and Kant's value theories. By carefully analysing Aristotle's and Kant's theories of the highest good, a team of experts in the field shed light on their respective ethical theories and highlight the richness, complexity, and fruitfulness of the notion of the highest good.

Peter Byrne presents a detailed study of the role of the concept of God in Kant's Critical Philosophy. After a preliminary survey of the major interpretative disputes over the understanding of Kant on God, Byrne explores his critique of philosophical proofs of God’s existence. Examining Kant’s account of religious language, Byrne highlights both the realist and anti-realist elements contained within it. The notion of the highest good is then explored, with its constituent elements – happiness and virtue, in pursuit of an assessment of how far Kant establishes that we must posit God. The precise role God plays in ethics according to Kant is then examined, along with the definition of religion as the recognition of duties as divine commands. Byrne also plots Kant’s critical re-working of the concept of grace. The book closes with a survey of the relation between the Critical Philosophy and Christianity on the one hand and deism on the other.