Abstract

This chapter defends commonsense realism from the underdetermination theses of extreme skepticism. If true, these would count against nearly all our knowledge and hence undermine realism about the observable world. The traditional responses to these theses rest on a priori knowledge. The chapter rejects a priori knowledge, but even if there were such knowledge, these traditional responses tend to involve bizarre metaphysics and to be otherwise unsatisfactory. Instead, it offers a Moorean response: realism is much more firmly based than the epistemological theses that are thought to undermine it. The Moorean response is supported by a naturalistic one that appeals to scientific practice. Rather than proceeding form an a priori epistemology to an a priori metaphysics, we should proceed from an empirical metaphysics to an empirical epistemology. We should put metaphysics first.