An Indeterminate Conception of Practical Reasoning

This paper makes a case for treating the boundary between what counts as practical reasoning and what does not as essentially indeterminate. The idea that there is an “essential indeterminacy in what can be counted as a rational deliberative process” was put forward by Bernard Williams in his well‐known discussion of statements about an agent's reasons for action. But in contrast to the more familiar argument of that paper, the idea has received almost no attention. To understand and defend the idea, I first offer a somewhat novel reconstruction of the more familiar argument against making statements about a person's reasons intended on an “external” interpretation. On my reading, the argument shows how making such statements runs afoul of ideals of honesty in our interpersonal dealings. I then argue for countenancing an essential indeterminacy in what counts as practical reasoning, in a manner that involves a re‐application of these same ideals of honesty, albeit at a higher level of abstraction. One advantage of understanding the entire discussion of reasons statements and reasoning along these lines is that it highlights the deeply anti‐rationalistic flavor of Williams' own interest in these topics. Unsurprisingly, Williams' treatment displays a deep affinity with the anti‐rationalistic ethics advanced by Hume. It also turns out to be at cross purposes with the far more rationalistic ethical vision that animates more recent attempts to advance a “Humean Theory of Reasons,” which is sometimes mistakenly seen as following in Williams' and Hume's footsteps.