'The Rational and the Moral Order' is a significant book providing a comprehensive theory of morality. The opening chapter is simply marvellous. Baier provides a cogent response to Hume's conundrums on practical reasoning: logical entailment, he argues, is not the correct model of the relation between reasons and that for which they are reasons. Indeed, the giving of reasons is, in part, a social enterprise, and there is no necessary connection between rationality and self-interest.

Just as the giving of reasons is a social enterprise taught to succeeding generations, so too is the moral...