Knowledge and the permissibility of action

I argue in favor of a certain connection between knowledge and the permissibility of action. On this approach, we do not think of the relation between those notions as reflecting a universal epistemic principle. Instead, we think of it as something resembling a platitude from folk psychology. With the help of some elementary tools from the logic of normativity and counterfactuals, I attempt to establish the connection by deriving it from more elementary principles. The new formulation involves a ceteris paribus clause. Though it is often difficult to specify the exact content of a ceteris paribus clause, we will see that our clause is derived from a descriptive generalization with independent motivation.