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Parfit argues that naturalistic theories that seek to understand normative concepts either as simply descriptive of certain natural facts about our desires or as expressive of our desires commit us to a bleak normative nihilism whereby nothing matters. I here defend such naturalism, in particular its expressivist variety, against this charge. It is true that such views commit us to there being no reasons as Parfit understands them. But for Parfit to suppose that equivalent to there being no reasons leaves him begging the question where the relative credibility of these rival understandings is just what is at issue.1

In this paper I offer a solution to scepticism about the world which neither embraces idealism, nor ends in a stalemate, nor begs the question against the sceptic. In the first part of the paper I explicate the sceptical argument and try to show why it has real force. In the next part of the paper I propose a version of the relevant possibilities approach to scepticism. The central claim of the proposed solution is that a sceptical possibility undermines knowledge only if the possibility is true in some close possible world. But since there is no reason to believe that I am deceived by an evil demon or that I am a brain in a vat in some close possible world, there is no reason to accept an essential premise of the sceptical argument, i.e. that the sceptical scenarios are relevant possibilities. Finally, I argue that the solution proposed does not embrace idealism, end in a stalemate, or beg the question.