Reasons, Perceptual Grounds, and Normative Explanation
Reasons come in many forms. There are reasons to believe, for believing, for which one believes, and why one believes; and some are internal reasons we have, others external reasons we lack. This chapter clarifies how we have normative reasons for beliefs in virtue of certain experiential states that ground those reasons: these states, including sense-experiences and hedonic experiences, are the kinds that ground the rationality of beliefs or the desirability of acts. Normative reasons, practical as well as theoretical, are themselves grounded in certain experiential elements, including perceptions as a central kind. Normative reasons for belief are unified by their explanatory scope: they can explain propositional justification—roughly, justification that at least permits our properly believing propositions adequately supported by our experience. These normative explanations parallel causal explanations that hold between the experiential elements, such as perceptions, that ground the reasons and the doxastically justified beliefs that reflect those experiences.