Jonathan L. Kvanvig

This chapter examines the logical structure of the knowability paradox, presenting the details of the proofs that underlie the paradox, and clarifying which elements of these proofs give rise to paradox. It argues that there is no simple and obvious logical mistake in the derivation of the knowability result. A paradox has deep significance only if it arises from plausible premises. Those in question in Fitch’s proof are the claim of epistemic modesty, that some truths will never be known, and the knowability principle that all truths are knowable. Although the second claim does not have the same intuitive pull as the first, there are substantive grounds in its favour; grounds that some hold show that all truths are knowable, but which show at the very least that it is plausible to maintain that all truths are knowable.

Ernest Sosa's latest epistemology remains a version of virtue epistemology, and I argue here that it faces two central problems, pressing a point I have made elsewhere, that virtue epistemology does not present a complete answer to the problem of the value of knowledge. I will press this point regarding the nature of knowledge through variations on two standard Gettier examples here. The first is the Fake Barn case and the second is the Tom Grabit case. I will argue that Sosa's latest virtue epistemology fails to handle either case acceptably, and that as a result, cannot explain the value that knowledge has over that of the sum of any of its proper subparts. La última epistemología de Ernest Sosa continúa siendo una versión de epistemología de las virtudes, y siguiendo con una idea que ya planteé en otra parte, aquí argumento que afronta dos problemas centrales: que la epistemología de las virtudes no presenta una respuesta completa al problema del valor del conocimiento. Insistiré en esta idea sobre la naturaleza del conocimiento mediante variaciones de dos ejemplos estándares tipo Gettier. El primero es el caso del granero falso y el segundo es el caso de Tom Grabit. Argumentaré que la última epistemología de las virtudes de Sosa no maneja ninguno de estos casos de forma aceptable, y en consecuencia no puede explicar el valor que tiene el conocimiento por encima del de la suma de cualesquiera de sus propias partes.

This chapter explores the challenge to the proof of Fitch’s results presented by intuitionism, and the prospects of this viewpoint in avoiding the paradox that results. It argues that adopting intuitionistic principles of reasoning will not help avoid the paradox. It merely changes what is paradoxical from a lost distinction between known truth and knowable truth, to a lost distinction between unknown truth and unknowable truth. Since paradox remains in both cases, the solution to the paradox must be found elsewhere.

Motivated by Plantinga's work, fourteen prominent philosophers have written new essays investigating Plantingian warrant and its contribution to contemporary epistemology. The resulting collection, representing a broad array of views, not only gives readers a critical perspective on Plantinga's landmark work, but also provides in one volume a clear statement of the variety of approaches to the nature of warrant within contemporary epistemology and to the connections between epistemology and metaphysics.

IN COMPARISON with other doctrines Cthe doctrine of omnipotence, for example Cthe proper formulation of the doctrine of omniscience has not seemed especially problematic. Once we accept the contemporary wisdom that knowledge is knowledge of truths, the formulation of the traditional doctrine seems straightforward: to be omniscient is just to know all truths. What has seemed problematic, rather, is whether the doctrine is itself true. In particular, many have wondered whether anyone can know the parts of the future not necessitated in any way by the present or past.

In recent years, epistemologists have become increasingly impressed with reliabilist theories of justification. 1 Reliabilism is often formulated as the claim that a belief is justified 2 just in case it is a reliable belief; however, this formulation can be somewhat misleading. There is a sense in which a set of beliefs can be reliable, just as a certain history or testimony can be reliable: what one means is that a certain set of propositions is highly accurate, has mostly true members, or is not wrong in any important way. Reliabilists, though, do not just want to say that a belief is justified just in case it is a member of a type with mostly true members, i.e., just in case it is probably true; they also want to appeal to the notion of reliability in that sense in which we say that persons, processes, proce­dures, tests, and experiments are reliable. Reliabilism is a view both about the reliability of beliefs and about the reliability of the person who has the belief or the procedure that is responsible for the belief.

I came to epistemology through an interest in the concept of rationality, and especially through the attacks on the rationality of religious believers. My thoughts at the time focused on the disappointing quality of the arguments for and against religious belief, and I recall being astonished at the time that philosophers capable of such penetrating insight in other areas had nothing that seemed either penetrating or original. The defenders sounded too much like mere apologists for the faith, and the attackers arid and dull, with both sides often exuding a scent of intellectual dishonesty.