Ernest Sosa

Epistemology is too far-flung and diverse for a survey in a single essay. I have settled for a snapshot which, though perforce superficial and partial, might yet provide an overview. My perspective is determined by the books and articles prominent in the recent literature and in my own recent courses and seminars. Seeing that the boundaries of our field have shifted through the ages and are even now very ill-marked, I have chosen two central issues, each under vigorous and many-sided discussion in recent years and at present: (A) Scepticism, and (B) Theories of Justification; and in each case I shall focus on work either published or widely discussed within the last five years.

Polyfacetic epistemology would answer the skeptic, provide how-to-think manuals, explain how we know, and more. To some it is the project of assuring oneself, of validating one's knowledge or supposed knowledge, turning it into real and assured knowledge, thus defeating the skeptic. To others it is a set of rules or instructions, a guide to the perplexed, a manual for conducting the intellect. To others yet it is a meta-discipline, but one whose purpose is not nearly so much guidance as understanding, understanding of what gives us the knowledge we do have, of what factors serve to justify so many of our beliefs well enough to make them knowledge. What follows is epistemology as understanding, an attempt to understand the relation between epistemic coherence and intellectual virtue at the foundation of epistemology: between the comprehensive coherence prized in the thirst for understanding and the "reliability" that makes a faculty or procedure intellectually virtuous.

Having fascinated some of the greatest philosophers from the earliest times, dreaming figures importantly in the history of philosophy, as in Plato’s Theaetetus, Augustine’s Confessions, and, perhaps most famously, Descartes’s Mediations. By far the greatest philosophical focus on dreaming has been epistemic: Socrates suggests to Theaetetus that since he cannot tell whether he is dreaming, he cannot trust his senses to know contingent facts about the world around him. And a similar worry drives Descartes’s radical doubt in the First Meditation. We might think that dream skepticism is, among the radical Cartesian skeptical scenarios, a particularly worrying one, since dreams, unlike evil demons, are a commonplace of everyday life.

1. Sensa and propositional experience. 2. An option between propositions and properties (as objects or contents of sensory experience). 3. The property option and adverbialism. 4. Sensa as images, images as intentionalia. 5. Do we refer directly to sensa? 6. Focusing and the supervenience of images and our reference to them: a question raised. 7. Internal and external properties of images and characters. Strict vistas introduced. 8. A correction on strict vistas. 9. Focusing and experience: the question answered. 10. Conclusion.

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

The received definition of knowledge (as true, evident belief) has recently been questioned by Edmund Gettier with an example whose principle is as follows. A proposition, p, is both evident to and accepted by someone S, who sees that its truth entails (would entail) (that either p is true or q is true). This last is thereby made evident to him, and he accepts it, but it happens to be true only because q is true, since p is in fact false. Hence, inasmuch as he has no evidence for the proposition q, S can hardly be said to know (that either p is true or q is true). Here then is a formula for true, evident beliefs that are not cases of knowledge. I discuss the possibility of adding a fourth condition to this triad.

Ernest Sosa extends his distinctive approach to epistemology, intertwining issues concerning the role of the will in judgment and belief with issues of epistemic evaluation. Questions about skepticism and the nature of knowledge are at the forefront. The answers defended are new in their explicit and sustained focus on judgment and epistemic agency. While noting that human knowledge trades on distinctive psychological capacities, Sosa also emphasizes the role of the social in human knowledge. Basic animal knowledge is supplemented by a level of reflective knowledge focused on judgment, and a level of 'knowing full well' that is distinctive of the animal that is rational.