Kant on virtue and justice (Immanuel Kant)

In this thesis I consider two common, though directly opposed, interpretations of Kantian morality. According to what I call “the other-regarding interpretation,” Kantian morality is primarily about the regulation of human interaction. According to what I call “the private and internal interpretation,” Kantian morality is primarily self-regarding since what chiefly matters, on this view, is adopting moral motives. I argue that both interpretations rest on a failure to understand Kant's distinction between ethics (personal morality) and justice (political morality), a distinction which he introduces in The Metaphysics of Morals, on which I primarily focus. As I interpret this distinction, ethics addresses the question about the supreme individual good (which, according to Kant, is virtue), whereas justice addresses the question how to make possible the coexistence of the freedom of action of a plurality of agents who pursue their personal ends. I argue that the other-regarding interpretation tends to reduce morality to justice (to the neglect of virtue), whereas the internal and private interpretation reduces morality to ethics and cannot accommodate Kantian justice as part of morality. I focus most of my attention on the former view because it has been significantly more influential in recent debates. Against this view, I argue that ethics, on Kant's account, is about the pursuit of the supreme individual good (virtue), and not about the regulation of human interaction. The tendency to reduce morality to justice is manifest in the thesis that the justification of principles of personal morality rest upon an agreement as well as in a certain version of the thesis of the priority of the right over the good. Both theses are present in the work of Jürgen Habermas. The use of agreement is common among followers of John Rawls's who attempt to extend his Contractarian justification of principles of justice to the domain of personal morality. Such an extension, I argue, presupposes an understanding of personal morality by analogy with justice. Paradoxically, these two theses are regarded as “Kantian,” though they have contributed to the distortion in recent debates of what I argue is central to Kant's ethics.