Locke: Skepticism

ABSTRACT In this paper I propose that examining Locke’s response to skepticism requires us to consider at least three distinct senses in which skepticism appears on the horizon of the Essay. Skepticism is addressed, directly or indirectly, (i) as a general outcome of philosophical inquiry, (ii) as a methodical decision to doubt, and also (iii) as the result of a particular problem that challenges the claim to knowledge. I think that by examining how Locke reacts to such issues, we get (...) a more accurate and nuanced picture of Locke’s relationship to skeptical philosophy. (shrink)

In this paper I contend that Locke is both a realist and a skeptic regarding the mind-independent bodies which are causally responsible for our ideas of sense. Although he frequently indicates that we have experiential knowledge of these bodies, I argue that this was not his considered position. In support of this conclusion I turn: first, to the basic contours of his accounts of knowledge and perception; second, to his argument for the existence of the material world; and third, to (...) his discussions of judgment and probability. Locke’s considered position, I contend, is that instances of veridical perception do not yield genuine instances of knowledge. Rather, these perceptual encounters give rise to empirical judgments which enjoy a high degree of probability. While this prevents them from being suitable objects of knowledge, since Locke thinks that we can be nearly certain of their truth, he contends that we should not hesitate to think, speak and act as if they were instances of knowledge. I further argue that this account provides us with a more satisfying explanation of Locke’s dismissive attitude towards the skeptical hypotheses which appear throughout the Essay. (shrink)

In the Essay Concerning Human Understanding, Locke insists that all knowledge consists in perception of the agreement or disagreement of ideas. However, he also insists that knowledge extends to outer reality, claiming that perception yields ‘sensitive knowledge’ of the existence of outer objects. Some scholars have argued that Locke did not really mean to restrict knowledge to perceptions of relations within the realm of ideas; others have argued that sensitive knowledge is not strictly speaking a form of knowledge for Locke. (...) This chapter argues that Locke’s conception of sensitive knowledge is in fact compatible with his official definition of knowledge, and discusses his treatment of the problem of skepticism, both in the Essay and in the correspondence with Stillingfleet. (shrink)

The standard objection to Locke’s epistemology is that his conception of knowledge inevitably leads to skepticism about external objects. One reason for this complaint is that Locke defines knowledge as the perception of a relation between ideas, but perceiving relations between ideas does not seem like the kind of thing that can give us knowledge that tables and chairs exist. Thus Locke’s general definition of knowledge seems to be woefully inadequate for explaining knowledge of external objects. However, this interpretation and (...) subsequent criticism ignore a special category of knowledge Locke calls “real knowledge”, which is Locke’s own account of how we can have knowledge of the real world. In in this paper I argue that real knowledge of substances requires that, in addition to the perception of a relation between ideas, there be a necessary connection between our ideas and the external objects they represent. It is because Locke thinks there is a necessary connection between these ideas and reality that he thinks the perception of ideas can give us knowledge of the actual world. (shrink)

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The problem of how we can know the existence and nature of the world external to our mind is one of the oldest and most difficult in philosophy. The discussion by John Locke (1632-1704) of knowledge of the external world have proved to be some of the most confusing and difficult passages of his entire body of philosophical work.

Locke Defines Knowledge at the beginning of Book IV of the Essay concerning Human Understanding as “the perception of the connexion and agreement, or disagreement and repugnancy of any of our Ideas” (E IV.i.2).1 So defined, knowledge varies along two dimensions. On the one hand, there are four “sorts” of knowledge: of identity or diversity; relation; co-existence or necessary connection; and real existence. On the other hand, there are three “degrees” of knowledge: intuitive knowledge, which consists in the “immediate” perception (...) of agreement or disagreement between ideas (E IV.ii.1); demonstrative knowledge, which consists in the perception of agreement or disagreement by way of intermediate (or intervening) .. (shrink)

In this paper I argue that Locke takes sensitive knowledge (i.e. knowledge from sensation) to be genuine knowledge that material objects exist. Samuel Rickless has recently argued that, for Locke, sensitive knowledge is merely an “assurance”, or a highly probable judgment that falls short of certainty. In reply, I show that Locke sometimes uses “assurance” to describe certain knowledge, and so the use of the term “assurance” to describe sensitive knowledge does not entail that it is less than certain. Further, (...) I show that sensitive knowledge includes the perception of a relation between ideas, and thus it satisfies Locke’s definition of knowledge. He also repeatedly claims that sensitive knowledge is certain. So, despite recent challenges to this interpretation raised in the secondary literature, Locke really does take sensitive knowledge to be certain knowledge. (shrink)

Given his representationalism how can Locke claim we have sensitive knowledge of the external world? We can see the skeptic as asking two different questions: how we can know the existence of external things, or more specifically how we can know inferentially of the existence of external things. Locke's account of sensitive knowledge, a form of non-inferential knowledge, answers the first question. All we can achieve by inference is highly probable judgment. Because Locke's theory of knowledge includes both first order (...) psychological and second order normative conditions, sensitive knowledge can be non-inferential and less certain than intuitive and demonstrative knowledge. (shrink)

This article is an extended analysis of the most recent scholarly work on Locke's account of sensitive knowledge. Lex Newman's "dual cognitive relations" model of sensitive knowledge is examined in detail. The author argues that the dual cognitive relations model needs to be revised on both philosophical and historical grounds. While no attempt is made to defend Locke's position, the aim is to show that it is at least consistent, contrary to the received view. The final section provides textual support (...) for the interpretation. (shrink)

Locke claims that we have sensitive knowledge of the external world, in virtue of the fact that simple ideas are real, true, and adequate. However, despite his dismissive remarks about Cartesian external-world skepticism, Locke gives us little to go on as to how knowledge of the external world survives the fact of perceptual error, or even how perceptual error is possible. I argue that Locke has an in-principle problem explaining perceptual error.

This paper argues that Locke cannot provide a satisfactory account of perceptual error.

Plato -- Pyrrho -- The academics -- Sextus empiricus -- Augustine -- Erasmus -- Gianfrancesco Pico -- Hervet -- Montaigne -- Charron -- Sanchez -- Bacon -- Gassendi -- La Mothe le Vayer -- Descartes -- Pascal -- Glanvill -- Foucher -- Huet -- Locke -- Bayle -- Leibniz -- Crousaz -- Berkeley -- Ramsay -- Hume -- Voltaire -- Diderot -- Rousseau -- Kant -- Schulze -- Stäudlin -- Hegel -- Kierkegaard -- Nietzsche -- James -- Santayana -- Shestov (...) -- Wittgenstein -- Russell -- Popper -- Feyerabend -- Derrida -- Popkin -- Fogelin. (shrink)

This symposium comprises five papers on Locke's theory of sense perception. The authors are John Rogers, Gideon Yaffe, Lex Newman, Tom Lennon, and Martha Bolton. There are also comments on the papers, both individually and as a group, by Vere Chappell. In addition to Locke's view of perception, the papers deal with the nature of Lockean ideas and with the question whether Locke is committed to skepticism regarding the external world. The authors (and the commentator) disagree in their readings of (...) Locke on these issues, but most maintain--and some argue--that he holds a representative theory of perception, and that he is not an external-world skeptic. (shrink)

Interpreters of Locke’s Essay are divided over whether to attribute to him a Representational Theory of Perception (RTP). Those who object to an RTP interpretation cite (among other things) Locke’s Book IV account of sensitive knowledge, contending that the account is incompatible with RTP. The aim of this paper is to rebut this kind of objection – to defend an RTP reading of the relevant Book IV passages. Specifically, I address four influential assumptions (about sensitive knowledge) cited by opponents of (...) an RTP interpretation and argue that in each case the assumption is false. (shrink)

John Yolton has argued that Locke held a direct realist position according to which sensory ideas are not perceived intermediaries, as on the representational realist position, but acts that take material substances as objects. This paper argues that were Locke to accept the position Yolton attributes to him he could not at once account for appearance‐reality discrepancies and maintain one of his most important anti‐nativist arguments. The paper goes on to offer an interpretation of Locke's distinction between ideas of substances (...) and modes, a distinction that helps Locke to explain appearance‐reality discrepancies, although not in a large enough range of cases to strengthen Yolton's interpretation. (shrink)

Locke distingue : la connaissance intuitive, la connaissance rationnelle et la connaissance sensitive. C'est par celle-ci que nous accédons à la connaissance des « autres choses ». Or on peut se demander comment le sens peut être à la fois juge et témoin. En fait, pour Locke, notre connaissance des choses hors de nous a une « fiabilité effective », mais ce n'en est pas une connaissance parfaite, laquelle nous est inaccessible. Locke distinguishes : intuitive knowledge, rational knowledge, and sensitive (...) knowledge. It is through the latter that we reach the knowledge of « other things ». Now, one may wonder how can sense be both at the same time judge and witness. In fact, according to Locke, our knowledge of things outside ourselves bears some « effective reliability » but it is not necessarily a true knowledge, which is indeed unattainable. (shrink)

It is a noteworthy achievement of Western liberal democracies that they have largely relinquished the use of force against citizens whose lifestyles offend their members’ sensibilities, or alternatively which violate their members’ sense of truth. Toleration has become a central virtue in our public institutions. Powerful majorities are given over to restraint. They do not, by and large, expect the state to crush eccentrics, nonconformists, and other uncongenial minorities in their midst. What precipitated this remarkable evolution in our political culture?The (...) road to toleration originates in the debates provoked by religious dissent in the early modem period. This road was paved in part by a grudging appreciation of the necessity for pragmaticaccommodation. The wars of religion that had devastated the Continent educated the political classes about the costs of persecution. A policy of state-imposed religious intolerance was widely understood to be imprudent.In the early modem period there occurs, however, a shift in the arguments adduced in support of the duty of toleration. (shrink)

Many philosophers believe that the traditional problem of our knowledge of the external world was dissolved by Wittgestein and others. They argue that it was not really a problem - just a linguistic `confusion' that did not actually require a solution. Bruce Aune argues that they are wrong. He casts doubt on the generally accepted reasons for putting the problem aside and proposes an entirely new approach. By considering the history of the problem from Descartes to Kant, Aune shows that (...) analogous arguments create difficulties for the contemporary philosophical consensus. He makes it clear that the problem remains acute, particualarly for our understanding of scientific evidence. The solution he proposes draws upon contemporary philosophy of science and probability theory. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Locke on the Knowledge of Material Things ROBERT FENDEL ANDERSON IT IS nOT John Locke's intention, in his Essay Concerning Human Understanding, to deal with matter and material substance nor with how these are able to affect the mind. These are considerations for natural philosophy; Locke counts himself rather among the moral philosophers. He does not propose, therefore, to meddle with the physical aspects of the mind, nor with (...) the physical production of sensations through the organs, nor with the production of ideas in the understanding, nor even with whether ideas depend upon matter for their source. He defers to the wisdom of such men as Boyle, Sydenham, Huygens and Newton in these considerations, and finds it "... ambition enough to be employed as an under-labourer in clearing the ground a little, and removing some of the rubbish that lies in the way to knowledge....,, 1 It is true that Locke's Essay is characterized chiefly not by an interest in matter and the mechanics of perception but rather by an interest in epistemology and in the ordering and assessment of our knowledge. Because of the very nature and emphasis of this epistemology, however, Locke finds that he must, from time to time, at least mention the nature of matter and how it affects us. Finally, it becomes apparent, certain changes or ambiguities in his point of view regarding the mode of our knowledge and its certainty are consequences of his understanding of matter. It is a demonstration of these elements of his doctrine, which seem not to have obtained the full attention of such scholars as Aaron, Fraser, and Gibson, that I shall attempt in this paper. Fundamentally, Locke's theory of matter appears to be that of Democritus and Epicurus. Like the Greek atomists, he conceives of matter as consisting of particles or corpuscles infinite in number. At least some of these are so minute as to be individually insensible, and probably he intends that all are, although, to my knowledge, he never states that this is so. In the aggregate, in any case, particles do constitute perceptible bodies. As for the Greeks, so also for Locke, the particles arc all extended, having size and shape. They are said also to possess motion or rest, although he takes care to say that matter cannot produce motion in itself,e Locke frequently mentions other properties as being "primary" or "really in" material things. Some of these are solidity, texture, cohesion of parts, situation, and number. Apparently some of these may be ranked under others since, as he 1"Epistle to the Reader," Vol. I, p. 14. All footnotes refer to passages in John Locke's An Essay Concerning Human Understanding, collated and annotated, with prolegomena, biographical, critical, and historical by Alexander Campbell Fraser, in two volumes (New York, Dover Publications, Inc., 1959). Large Roman numerals refer to books of the Essay; small Roman numerals refer to chapters of the books; Arabic numerals refer to sections of the chapters. 2 IV, x, 10. [205] 206 HISTORY OF PHILOSOPHY remarks, figure presupposes extension, and receiving or communicating motion through impact presupposes solidity. The influences of these particles upon one another are treated by Locke under the topic of "powers," a notion which includes in it some kind of "secret relation of parts." 3 The capacities in any substance to give alterations of primary qualities are active powers; the capacities to receive such alterations are passive powers. This alteration must be accomplished by impact or impulse since this, Locke says, is the only way in which bodies can be conceived to operate. Sensation in the percipient being then is to be understood as a special case of this impact of particles upon others. It is evident to Locke that from external obiects some motion must be conveyed by some parts of our bodies to the brain or seat of sensation to produce in our minds the particular ideas we have of these external objects. We are able by sight to perceive at a distance the primary qualities of bodies of observable size. Locke reasons that therefore "... some singly imperceptible bodies must come from them to the eyes, and thereby convey to... (shrink)

The work now presented to the reader supposes careful students of the philosophy of the mind, with access to the books which profess to treat of it. It is a plea for English Philosophy and its great master. It consists of two parts.