The traditional argument for skepticism relies on a comparison between a normal subject and a subject in a skeptical scenario: because there is no relevant difference between them, neither has knowledge. Externalists respond by arguing that there is in fact a relevant difference—the normal subject is properly situated in her environment. I argue, however, that there is another sort of comparison available—one between a normal subject and a subject with a belief that is accidentally true—that makes possible a new argument (...) for skepticism. Unlike the traditional form of skeptical argument, this new argument applies equally well to both internalist and externalist theories of knowledge. (shrink)

When one depends on a belief source in sustaining a belief that that very belief source is trustworthy, then that belief is an epistemically circular belief. A number of philosophers have objected to externalism in epistemology on the grounds that it commits one to thinking EC-beliefs can be justified, something they view as an unhappy consequence for externalism. In my 2004, I defend externalism against this sort of charge by explaining why this consequence needn’t be an unhappy one. In the (...) course of doing so, I appeal to what Thomas Reid calls ‘common sense’—a faculty or belief source by which we know noninferentially such things as that our faculties are trustworthy. In his 2006, Baron Reed raises what he takes to be serious objections to what I say about both epistemic circularity and common sense. In what follows, I’ll respond to his objections, explaining why I side with Reid against Reed. (shrink)

This volume consists of the first of the John Dewey Lectures delivered under the auspices of Columbia University's Philosophy Department as well as other essays by the author. Intended to clarify the meaning of the philosophical doctrines propounded by Professor Quine in 'Word and Objects', the essays included herein both support and expand those doctrines.

Recent iterations of Alvin Plantinga’s “evolutionary argument against naturalism” bear a surprising resemblance to a famous argument in Descartes’s Third Meditation. Both arguments conclude that theists have an epistemic advantage over atheists/naturalists vis-à-vis the question whether or not our cognitive faculties are reliable. In this paper, I show how these arguments bear an even deeper resemblance to each other. After bringing the problem of evil to bear negatively on Descartes’s argument, I argue that, given these similarities, atheists can wield a (...) recent solution to the problem of evil against theism in much the way Plantinga wields the detailsof evolutionary theory against naturalism. I conclude that Plantinga and Descartes give us insufficient reason for thinking theists are in a better epistemic position than atheists and naturalists vis-à-vis the question whether or not our cognitive faculties are reliable. (shrink)

Skeptical theists endorse the skeptical thesis (which is consistent with the rejection of theism) that we have no good reason for thinking the possible goods we know of are representative of the possible goods there are. In his newest formulation of the evidential arguments from evil, William Rowe tries to avoid assuming the falsity of this skeptical thesis, presumably because it seems so plausible. I argue that his new argument fails to avoid doing this. Then I defend that skeptical thesis (...) against objections, thereby supporting my contention that relying on its falsity is a weakness in an argument. (shrink)

This paper offers a commonsense response to Alvin Plantinga’s evolutionary argument against naturalism. The first stage of that argument concludes that the probability that our cognitive faculties are reliable (R) is low or inscrutable given the claims that naturalism is true (N) and that our cognitive faculties came into existence by way of the mechanisms of evolution (E)—i.e., that P(R/N&E) is low or inscrutable. The second stage claims that the fact that P(R/N&E) is low or inscrutable constitutes a defeater for (...) belief in R, for anyone who endorses N&E. For the purposes of this paper, I will grant to Plantinga the conclusion of the first stage of his argument—that P(R/N&E) is low or inscrutable when specified to us. My contention is simply that, given what we can know via commonsense, this does not necessarily constitute a defeater for R for the supporter of N&E. (shrink)

This is the third volume in Alvin Plantinga's trilogy on the notion of warrant, which he defines as that which distinguishes knowledge from true belief. In this volume, Plantinga examines warrant's role in theistic belief, tackling the questions of whether it is rational, reasonable, justifiable, and warranted to accept Christian belief and whether there is something epistemically unacceptable in doing so. He contends that Christian beliefs are warranted to the extent that they are formed by properly functioning cognitive faculties, thus, (...) insofar as they are warranted, Christian beliefs are knowledge if they are true. (shrink)

Alvin Plantinga has famously argued that naturalism is self-defeating. Plantinga's argument is, at its heart, an argument from analogy. Plantinga presents various epistemic situations and claims of each that (i) a person in such a situation has an undefeated defeater for each of his beliefs, and (ii) a reflective naturalist is in a relevantly similar situation. I present various epistemic situations and claim of each that a person in such a situation does not have an undefeated defeater for each of (...) his beliefs. I further claim that at least some of these situations are more relevantly like the situation faced by the reflective naturalist than any of the situations Plantinga describes. Therefore, Plantinga's argument fails to establish that the reflective naturalist has an undefeated defeater for each of his beliefs and hence fails to establish that naturalism is self-defeating. (shrink)

Alvin Plantinga has famously argued that metaphysical naturalism is self-defeating, and cannot be rationally accepted. I distinguish between two different ways of understanding this argument, which I call the "probabilistic inference conception", and the "process characteristic conception". I argue that the former is what critics of the argument usually presuppose, whereas most critical responses fail when one assumes the latter conception. To illustrate this, I examine three standard objections to Plantinga's evolutionary argument against naturalism: the Perspiration Objection, the Tu Quoque (...) Objection, and the "Why Can't the Naturalist Just Add a Little Something?" Objection. I show that Plantinga's own responses to these objections fail, and propose counterexamples to his first two principles of defeat. I then go on to construct more adequate responses to these objections, using the distinctions I develop in the first part of the paper. (shrink)

Epistemology - the theory of knowledge and of justified belief - has always been of central importance in philosophy. Progress in other areas of philosophical research has often depended crucially on epistemological presuppositions. This Companion, with well over 250 articles ranging from summary discussions to major essays on topics of current controversy, is the first complete reference work devoted to the subject. All the main theoretical positions in epistemology are discussed and analysed, tougher with the different categories of knowledge itself (...) - scientific, historical, mathematical, a priori, moral and so on - and the special problems associated with these. There are also many entries covering individual concepts, arguments and problems, short definitions of technical terms, and biographical articles. With its unrivalled coverage of the field, supported by a comprehensive index and an extensive cross-referencing, the Companion is likely to remain the standard reference work in epistemology from undergraduate level upward for the foreseeable future. (shrink)

Epistemic circularity occurs when a subject forms the belief that a faculty F is reliable through the use of F. Although this is often thought to be vicious, externalist theories generally don't rule it out. For some philosophers, this is a reason to reject externalism. However, Michael Bergmann defends externalism by drawing on the tradition of common sense in two ways. First, he concedes that epistemically circular beliefs cannot answer a subject's doubts about her cognitive faculties. But, he argues, subjects (...) don't have such doubts, so epistemically circular beliefs are rarely called upon to play this role. Second, following Thomas Reid, Bergmann argues that we have noninferential, though epistemically circular, knowledge that our faculties are reliable. I argue, however, that Bergmann's view is undermined by doubts a subject should have and that there is no plausible explanation for how we can have noninferential knowledge that our faculties are reliable. (shrink)