Kieran Setiya

Modern philosophy has been vexed by the question "Why should I be moral?" and by doubts about the rational authority of moral virtue. In Reasons without Rationalism, Kieran Setiya shows that these doubts rest on a mistake. The "should" of practical reason cannot be understood apart from the virtues of character, including such moral virtues as justice and benevolence, and the considerations to which the virtues make one sensitive thereby count as reasons to act. Proposing a new framework for debates about practical reason, Setiya argues that the only alternative to this "virtue theory" is a form of ethical rationalism in which reasons derive from the nature of intentional action. Despite its recent popularity, however, ethical rationalism is false. It wrongly assumes that we act "under the guise of the good," or it relies on dubious views about intention and motivation. It follows from the failure of rationalism that the virtue theory is true: we cannot be fully good without the perfection of practical reason, or have that perfection without being good. Addressing such topics as the psychology of virtue and the explanation of action, Reasons without Rationalism is essential reading for philosophers interested in ethics, rationality, or the philosophy of mind.

To begin with, I am deeply grateful to Michael Bratman and Michael Smith for their generosity in responding to my book, for the care with which they have read it, and for the challenge of meeting their objections. I am also grateful for their support and encouragement over the years. It is a pleasure to engage with them here.Because their comments raise many related difficulties, this reply will treat them together, beginning with brief consideration of issues in action theory before turning to Reasons and rationalism. It will also be incomplete: there is much more to say about these problems than can be said in this space.Bratman's discussion poses a structural question: how far does my argument about reason and virtue in Part Two of the book depend on the principle of Belief and the cognitive theory of intention from Part One? His answer is: quite a bit. But this is not straightforward. If we reject Belief, our account of acting for reasons becomes more minimal. This would make it more difficult to derive standards of practical reason from the nature of agency, as the rationalist purports to do. If I am right to argue that rationalism and the virtue theory are exhaustive alternatives, it therefore makes the virtue theory of practical reason easier to defend. My Anscombean assumptions are in fact a concession to some of the ideas that motivate rationalists like Korsgaard and Velleman – though not, as we will see, either Bratman or Smith. Denying them makes more trouble for the ethical views that I oppose than it does for mine. 1What does matter to my argument is that when we act intentionally, or for reasons, we need not do so ‘under the guise of the good’, since the doctrine that we must …