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Ludwig Wittgenstein's On Certainty was finished just before his death in 1951 and is a running commentary on three of G.E. Moore's greatest epistemological papers. In the early 1930s, Moore had written a lengthy commentary on Wittgenstein, anticipating some of the issues Wittgenstein would discuss in On Certainty. The philosophical relationship between these two great philosophers and their overlapping, but nevertheless differing, views is the subject of this book. Both defended the existence of certainty and thus opposed any form of skepticism. However, their defenses and conceptions of certainty differed widely, as did their understanding of the nature of skepticism and how best to combat it. Stroll's book contains a careful and critical analysis of their differing approaches to a set of fundamental epistemological problems.

This paper compares Wittgenstein's conception of ?objective certainty? with Descartes's ?metaphysical certainty?. According to both conceptions if you are certain of something in these senses, then it is inconceivable that you are mistaken. But a striking difference is that for Descartes, if you are metaphysically certain of something it follows both that the something is so and that you know it is so; whereas on Wittgenstein's conception neither thing follows. I try to show that there is a form of ?scepticism? in Wittgenstein's outlook on the concept of certainty, although it is not the familiar Philosophical Scepticism. The Appendix takes issue with a recent essay by John Cook which argues that the ?hinge propositions? of On Certainty are based on ?the metaphysics of phenomenalism?

As is well known, Wittgenstein pointed out an asymmetry between first- and third-person psychological statements: the first, unlike the latter, involve observation or a claim to knowledge and are constitutionally open to uncertainty. In this paper, I challenge this asymmetry and Wittgenstein's own affirmation of the constitutional uncertainty of third-person psychological statements, and argue that Wittgenstein ultimately did too. I first show that, on his view, most of our third-person psychological statements are noncognitive; they stem from a subjective certainty: a certainty which, though not the result of an epistemic process, is not invulnerable to error in that it is a kind of assumption. I then trace Wittgenstein's realization that some third-person psychological certainties are not merely subjective but 'objective' (which means, as he uses the word, that they are logically indubitable): in some cases, we can be as logically certain that someone else is in pain than we are about ourselves being in pain. This positively reinforces Wittgenstein's rebuttal of other mind scepticism. I conclude with a response to objections about the legitimacy of calling an assurance that is logical (i.e., that does not have uncertainty or doubt on its flipside) a 'certainty', by suggesting that the flipside is to be found in pathological cases, and most pertinently here, in cases of dyssemia: a rare disorder affecting the ability to properly express or recognize basic physical expressions of feeling.

This paper surveys the impact on neuropsychology of Wittgenstein's elucidations of memory. Wittgenstein discredited the storage and imprint models of memory, dissolved the conceptual link between memory and mental images or representations and, upholding the context-sensitivity of memory, made room for a family resemblance concept of memory, where remembering can also amount to doing or saying something. While neuropsychology is still generally under the spell of archival and physiological notions of memory, Wittgenstein's reconceptions can be seen at work in its leading-edge practitioners. However, neuroscientists, generally, are finding memory difficult to demarcate from other cognitive and noncognitive processes, and I suggest this is largely due to their considering automatic responses as part of memory, termed nondeclarative or implicit memory. Taking my lead from Wittgenstein's On Certainty, I argue that there is only remembering where there is also some kind of mnemonic effort or attention, and, therefore, that so-called implicit memory is not memory at all, but a basic, noncognitive certainty.

The senses can completely dispel rational grounds for a certain kind of doubt, empirical doubt, but they cannot dispel another kind, sceptical doubt. In the first part of this paper, a hitherto unrecognized kind of knowledge-gathering activity, called sensory exploration, is described and discussed. It is argued, further, that sensory exploration eliminates a certain kind of doubt. In the second part, two kinds of doubt are distinguished in an original way. It is argued that only one of these kinds of doubt can be eliminated by sensory exploration.

This radical reading of Wittgenstein's third and last masterpiece, On Certainty, has major implications for philosophy. It elucidates Wittgenstein's ultimate thoughts on the nature of our basic beliefs and his demystification of scepticism. Our basic certainties are shown to be nonepistemic, nonpropositional attitudes that, as such, have no verbal occurrence but manifest themselves exclusively in our actions. This fundamental certainty is a belief-in, a primitive confidence or ur-trust whose practical nature bridges the hitherto unresolved categorial gap between belief and action.

In this paper Peter Klein's criticism of Wittgenstein in "Certainty: A Refutation of Scepticism" is addressed. Klein claims that, according to Wittgenstein, we attribute knowledge of a proposition p to a person only if that person is not certain of p. I argue that a careful reading of Wittgenstein's On Certainty reveals that there are two kinds of objective certainty that Wittgenstein had in mind; propositional objective certainty and normative objective certainty. Klein fails to distinguish between the two and uses what I call propositional objective certainty to make his point against Wittgenstein. I claim that when Wittgenstein said that knowledge and certainty belong to different categories he was talking of normative objective certainty and, therefore, that Klein's criticism is misplaced and attributes to Wittgenstein a position that is not his.

The idea that there is such a thing as Wittgensteinian foundationalism is a provocative one for two reasons. For one thing, Wittgenstein is widely regarded as an anti-foundationalist. For another, the very word `foundationalism' sounds like the name of a theory, and Wittgenstein famously opposed the advancing of theories and theses in philosophy. Nonetheless, in his book Moore and Wittgenstein on Certainty, Avrum Stroll has argued that Wittgenstein does indeed develop a foundationalist view in his final work, On Certainty. On this basis, Stroll goes on to argue against a number of contemporary views, including forms of relativism and scientism. In what follows I will examine what Stroll calls Wittgenstein's foundationalism (in Section 1) and argue that Stroll's reading of Wittgenstein, though original and interesting, is misguided in important ways and so cannot be used against the views he opposes (in Section 2). Finally, in Section 3, I offer a brief summary of the reading of Wittgenstein that I recommend.

In On Certainty, Wittgenstein’s reflections bring into view the phenomenon of basic certainty. He explores this phenomenon mostly in relation to our certainty with regard to empirical states of affairs. Drawing on these seminal observations and reflections, I extend the inquiry into what I call “basic moral certainty”, arguing that the latter plays the same kind of foundational role in our moral practices and judgements as basic empirical certainty does in our epistemic practices and judgements. I illustrate the nature and significance of basic moral certainty via critical examination of contemporary philosophical “explanations” of the wrongness of killing. These pseudo explanations, as I show them to be, will be seen to founder in a similar manner to Moore’s “Proof” of an external world, that is, in a manner that discloses the phenomenon of basic (moral) certainty.