Benjamin Kiesewetter has recently provided an argument to the effect that necessarily, if one has decisive reason to φ, then one has sufficient reason to believe that she herself has decisive reason to φ. If sound, this argument has important implications for several debates in contemporary normative philosophy. I argue that the main premise in the argument is problematic and should be rejected.According to this premise (PRR), necessarily, one can respond correctly to all the decisive reasons one has. I show that PRR is confronted with counterexamples and presupposes an implausible commensurability of all kinds of reasons. If so, the conclusion in Kiesewetter's argument doesn't follow. I also discuss further implications of my objections to PRR for a specific family of 'ought' implies 'can' principles and ability constraints on reasons, and the consequences that these could have for a number of contemporary debates in normative philosophy.
K E Y W O R D S'Ought' implies 'can', Kiesewetter, normativity, reasons, responding to reasons Several philosophers have recently argued for bridge-principles relating different kinds of normative reasons. 1 These principles suggest deep connections between different normative domains and posit substantive epistemic constraints on the set of considerations that can count as normative reasons. Perhaps the most interesting and remarkable of these principles has been defended recently by Benjamin Kiesewetter. 2 Kiesewetter argues for the following claim about normative reasons (where φ here is a placeholder for an action, an omission or an attitude such as believing, feeling, fearing, approving and so on):