Did Descartes manage to overcome the skeptics? If we understand “overcome” in the sense of “refute,” the answer is no, since his hyperbolic doubt harbors several blind spots and is, therefore, not as radical as is commonly argued. In this way, the victory of the cogito is perhaps less decisive and fruitful than it is claimed. If we understand “overcome” in the sense of “remove” or “move beyond,” the answer is yes. Descartes has overcome skepticism, but at the cost of (...) a decision, a sort of bet made in favor of reason based on a confidence in the human mind that is never really subverted. This faith in reason, truth, and specific epistemological principles in Descartes’ philosophy constitute what Wittgenstein calls “hinges,” which are indispensable for doubting and searching for truth. In this sense, Descartes’ anti-skepticism is more a confidence in reason in order to save the possibility of science than the result of a logical refutation. (shrink)

Résumé Descartes a adopté envers le scepticisme une attitude que d’aucuns parmi ses adversaires ont jugée ambiguë voire coupable. Il a recouru à des arguments sceptiques pour mettre en œuvre son célèbre doute qu’il concevait néanmoins comme l’acte inaugural d’une philosophie en quête de certitude scientifique. Descartes rejetait ainsi la fin poursuivie par les sceptiques et entendait user du doute contre le doute. Cette stratégie fondée sur un scepticisme des moyens pour combattre la fin et l’esprit même du scepticisme s’est-elle (...) révélée pertinente? Richard Popkin a pensé que non, dans son histoire du scepticisme, et conclu à l’échec d’un Descartes « sceptique malgré lui ». Je me propose de nuancer cette thèse de manière significative, suggérant que Descartes, sceptique à un second degré, était bien conscient de la finitude de l’esprit humain et des limites assignables à la recherche de la vérité des choses telles qu’elles sont en soi. (shrink)

This paper argues for a novel solution to the Cartesian Circle by emphasising the important epistemic role of the Second Meditation and Descartes’ faculty epistemology. I argue that, for Descartes: doubt requires a ‘good reason’ to doubt ; whether a reason qualifies as a ‘good reason’ depends on which faculty produces that reason ; and for distinct metaphysical perceptions from the faculty of the intellect, no other faculty can provide ‘good reasons’ to doubt. The upshot of §2 is that the (...) doubts raised up to the Third Meditation do not apply to the distinct metaphysical perceptions of the intellect, and in particular do not apply to the premises of the proof of the existence of God. I present the role of God as primarily to secure clear and distinct perceptions beyond the intellect, and knowledge of conclusions when those conclusions are no longer being clearly and distinctly perceived. Finally, I give an account of Descartes’ use of ‘ cognoscere ’, ‘ scire ’, and ‘ scientia ’ as three distinct epistemic levels, providing a valuable structure within which one can see the meditator progress. (shrink)

Descartes’ Meditations raised a serious question about whether he committed a logical fallacy while proving God’s existence and veracity. The crux of the allegation is him saying the truth of the clear and distinct perceptions depend on God’s veracity while its validity rests on some clear and distinct perceptions such as Cogito. At first glance Meditations justify this charge if not been attentively read. Disposal of the Cartesian circle claim depends on showing at least some clear and distinct perceptions are (...) spared from evil demon hypothesis. In this article I will argue that Cogito argument, truth rule and principles of reason specifically causality don’t need divine guarantee to grant their truth. Hence, I will defend that his arguments on proving God’s existence and veracity are circularity-proof. But still metaphysic foundations of Descartes’ epistemology rely substantially on God because without his veracity we are doomed to accept a fatal solipsism and never attain a solid ground for science, especially for physics. (shrink)

Do Descartes, Locke, and Hume have an internalist or externalist view of epistemic justification? Internalism is, roughly, the view that a belief that p is justified by a mental state, such as the awareness of evidence. By contrast, externalism is, roughly, the view that a belief that p is justified by facts about the belief-forming process, such as the reliability of the belief-forming process. I argue that they all think that the awareness of evidence is required for justification, but none (...) of them think that the awareness of evidence alone is sufficient for justification. Similarly, I argue that they all think that reliability of the belief-forming process is required for justification, but none of them think reliability alone is sufficient for justification. So, neither a fully internalist position nor a fully externalist position adequately captures their views of justification; rather, both the supporting evidence and the reliability of the belief-forming process explain why we should hold those beliefs, and hence explain why those beliefs are justified. Thus, they each have a partly internalist, partly externalist view of justification. (shrink)

Collection of papers presented at the First Budapest Seminar in Early Modern Philosophy.

This paper considers just how memory works throughout the Meditations to adduce Descartes’s conception of memory. Examining the meditator’s memory at work raises some questions about the nature of Cartesian memory and its epistemic role. What is the distinction between remembering and repeating a thought? If remembering is not simply repeating a thought, then what is involved in properly remembering? Can we remember properly while adding or shifting content, say, in virtue of articulating relations between ideas? If so, what is (...) the relation between remembering and reasoning, since both would then involve relations of ideas? These questions become salient in considering the meditator’s creative recollections in the Third and especially the Sixth Meditations. After briefly considering what Descartes does say about memory, I consider two other strategies for addressing those questions: an analogy with innate ideas, and attending to the role that other thinkers play in one’s own recollections. (shrink)

El articulo examina la aparente discrepancia en el pensamiento de Spinoza entre su teocentrismo epistemológico, según el cual todo es dudoso mientras desconocemos la existencia de Dios, y el principio verum index sui et falsi, según el cual la mera posesión de ideas verdaderas excluye toda incertidumbre. Lejos de contradecirse, estas dos afirmaciones constituyen en Spinoza dos aspectos correlativos del mismo planteamiento gnoseólogico. Se muestra así que la naturaleza divina no es ajena al intelecto humano y que este es capaz (...) de contemplar la realidad desde una perspectiva omnímoda, idéntica a la de Dios. (shrink)

In various arguments, Descartes relies on the principles that conceivability implies possibility and that inconceivability implies impossibility. Those principles are in tension with another Cartesian view about the source of modality, i.e. the doctrine of the free creation of eternal truths. In this paper, I develop a ‘two-modality’ interpretation of the doctrine of eternal truths which resolves the tension and I discuss how the resulting modal epistemology can still be relevant for the contemporary discussion.

El presente escrito presenta las ventajas y desventajas de la formalización matemática como una herramienta para el análisis de argumentos complejos o difusos en la filosofía. De tal forma, aquí se encuentra un recorrido histórico de algunas consideraciones del papel de las matemáticas en la búsqueda del conocimiento. Posterior a ello, se muestra cómo por medio de la teoría de conjuntos y laabstracción matemática, es posible proponer una reinterpretación de algunos textos filosóficos. Para lograr este objetivo, se presenta, a manera (...) de ejemplo, la formalización de los conceptos de “Dios”, “error” y “Creación” dados por Descartes en su libro las Meditaciones de la filosofía primera, este ejercicio permiteproponer una paradoja en donde se evidencia una posible falencia en la delimitación del concepto de Dios. Con todo ello, se demuestra por qué los enfoques matemáticos deben ser promovidos en los estudios filosóficos. (shrink)

Descartes is widely portrayed as the arch proponent of “the epistemological transparency of thought” (or simply, “Transparency”). The most promising version of this view—Transparency-through-Introspection—says that introspecting (i.e., inwardly attending to) a thought guarantees certain knowledge of that thought. But Descartes rejects this view and provides numerous counterexamples to it. I argue that, instead, Descartes’s theory of self-knowledge is just an application of his general theory of knowledge. According to his general theory, certain knowledge is acquired only through clear and distinct (...) intellection. Thus, in his view, certain knowledge of one’s thoughts is acquired only through clear and distinct intellection of one’s thoughts. Introspection is a form of intellection and it can be clear and distinct. Ordinarily, however, introspection isn’t clear and distinct but is instead confused with dubitable perceptions of bodies. To make introspection clear and distinct, we need to “sharply separate” it from all perceptions of bodies by doubting all perceptions of bodies. Without such radical doubt, introspection remains confused and we lack certain knowledge not just of the specific features of our thoughts, but even of the minimal claim that a thought exists. Far from being the high priest of Transparency, Descartes is radically opposed to it. (shrink)

This paper explicates Descartes’ theory of intuition (intuitus). Departing from certain commentators, I argue that intuition, for Descartes, is a form of clear and distinct intellectual perception. Because it is clear and distinct, it is indubitable, infallible, and provides a grade of certain knowledge he calls ‘cognitio’. I pay special attention to why he treats intuition as a form of perception, and what he means when he says it is ‘clear and distinct’. Finally, I situate his view in relation to (...) those of his Scholastic predecessors on one hand and current theories on the other. His view anticipates the contemporary ‘perceptual model of intuition’, though it is much bolder with its promise of certainty. (shrink)

This paper explicates Descartes’ theory of intuition (intuitus). Departing from certain commentators, I argue that intuition, for Descartes, is a form of clear and distinct intellectual perception. Because it is clear and distinct, it is indubitable, infallible, and provides a grade of certain knowledge he calls ‘cognitio’. I pay special attention to why he treats intuition as a form of perception, and what he means when he says it is ‘clear and distinct’. Finally, I situate his view in relation to (...) those of his Scholastic predecessors on one hand and current theories on the other. His view anticipates the contemporary ‘perceptual model of intuition’, though it is much bolder with its promise of certainty. (shrink)

In the Fifth Meditation Descartes considers the problem of knowledge preservation : the challenge of accounting for the diachronic certainty of perfect knowledge [scientia]. There are two general solutions to PKP in the literature: the regeneration solution and the infallible memory solution. While both readings pick up on features of Descartes’ considered view, I argue that they ultimately fall short. Salvaging pieces from both readings and drawing from Descartes’ virtue theory, I argue on textual and systematic grounds for a dispositionalist (...) solution. On this view, the diachronic certainty of scientia is achieved through virtuous habits of belief. (shrink)

This article explores the vocabulary of knowing in Descartes’ Meditations. It offers a detailed and in part sequential examination of his use of cognitio and scien...

In Squaring the Circle in Descartes’ Meditations, Stephen Wagner aims to show that Descartes’ project in the Meditations is best understood as a ‘strong validation of reason’ i.e., as proving in a non-circular way that human reason is a reliable, truth-conducive faculty. For such an enterprise to qualify as a ‘strong’ validation, Wagner contends, skeptical doubt must be given its strongest force. The most stringent doubt available in the Meditations is the deceiving God. To rule out the possibility that an (...) omnipotent God created humans so that their best functioning cognitive faculties provide misleading information about what the world is like, Descartes must prove that a non-deceiving God exists. Furthermore, only a non-circular proof will count as a ‘validation.’ Wagner spells out the requirements of non-circularity as involving a proof for God’s existence that is not deductive, does not simply achieve a clear and distinct perception of God’s existence, and proceeds on the basis of perceptions that remain true even when the reasons underlying them are not attended to any longer by the meditator. (shrink)

This paper tackles the famous predicament known as the Cartesian Circle. This notorious problem can be understood as manifesting an ancient dilemma—the diallelus, or the problem of the criterion. Now, the problem of the criterion can be approached from either particularistic or methodistic standpoint. In a nutshell, a particularist accepts instances of knowledge prior to criteria of knowledge, and the methodist goes the other way around. In this paper Descartes's struggle with the problem receives a particularistic reading. Using James Van (...) Cleve's and Jaakko Hintikka's thoughts as my main leverage, I argue that the particularist Descartes can reach knowledge without circularity. However, problems will remain and I shall bring out those that to me seem most pressing. (shrink)

ABSTRACTIn answering the circularity charge, Descartes consistently distinguished between truths whose demonstrations we currently perceive clearly and distinctly and truths whose demonstrations we merely remember having perceived clearly and distinctly. Descartes uses C-truths to prove God’s existence, thus validating R-truths. While avoiding one form of circularity, this introduces another circle, for Descartes believes that God’s existence validates R-truths even when itself an R-truth. I consider Newman and Nelson’s grounds enhancement strategy according to which this problem is solved when God’s existence (...) is rendered axiomatic. I argue that since it is still possible to doubt axioms when not directly apprehending them, this strategy cannot work; having to reproduce the argument for God’s existence in face of sceptical doubt is unavoidable. Drawing both on Newman and Nelson’s notion of grounds enhancement and on repr... (shrink)

Znaczenie epistemiczne aktualnie jasnych i wyraźnych ujęć w epistemologii Kartezjusza W niniejszym artykule omawiam kwestię dotyczącą roli, jaką Kartezjusz wyznaczył w budowie gmachu wiedzy pewnej temu, co można określić mianem aktualnie jasnych i wyraźnych ujęć. Powyższa kwestia jest od dawna przedmiotem ożywionej dyskusji wśród komentatorów epistemologii Kartezjusza. W współczesnej literaturze historyczno-filozoficznej spotkać można dwie zasadnicze interpretacje na temat funkcji jaką pełnią w systemie Kartezjusza aktualnie jasne i wyraźne ujęcia. Pierwszą można nazwać interpretacją psychologiczną, drugą zaś normatywną. Ta ostatnia głosi, że (...) aktualnie jasne i wyraźne ujęcia są całkowicie odporne na wątpienie zanim jeszcze dowiedzie się istnienia Boga i ustali ogólną regułę prawdy. Z tego względu ich pewność nie ogranicza się u Kartezjusza jedynie do pewności psychologicznej, lecz ma charakter normatywny. Opowiadam się za interpretacją normatywną. Przemawiają za nią – moim zdaniem – liczne racje. Ale rodzi ona także pewne trudności. Dlatego po przedstawieniu argumentów przemawiających na jej rzecz i niewątpliwych zalet wynikających z jej przyjęcia, omawiam szczegółowo pewne trudności zarówno tekstowe, jak i merytoryczne, którym musi sprostać ta interpretacja, jeśli mamy ją utrzymać. (shrink)

In two recent papers, Michael Della Rocca accuses Descartes of reasoning circularly in the Fourth Meditation. This alleged new circle is distinct from, and more vicious than, the traditional Cartesian Circle arising in the Third Meditation. We explain Della Rocca’s reasons for this accusation, showing that his argument is invalid.

In this essay, I discuss three readings of Descartes’ Meditations. According to the first reading, “I exist” is for Descartes the foundation of our knowledge. This reading is dismissed on the grounds that, in his view, as long as God’s existence is not proven there is a good reason to doubt this proposition. Proponents of the second reading claim that there are two kinds of Cartesian knowledge: perfect and imperfect knowledge. The meditator has imperfect knowledge of “I exist” before God’s (...) existence is proven. Subsequently, she acquires perfect knowledge of various metaphysical theorems. This reading is repudiated, too. I argue for a third reading, according to which “I think” – and not “I exist” – is the foundation of our knowledge. (shrink)

The expression “continental rationalism” refers to a set of views more or less shared by a number of philosophers active on the European continent during the latter two thirds of the seventeenth century and the beginning of the eighteenth. Rationalism is most often characterized as an epistemological position. On this view, to be a rationalist requires at least one of the following: (1) a privileging of reason and intuition over sensation and experience, (2) regarding all or most ideas as innate (...) rather than adventitious, (3) an emphasis on certain rather than merely probable knowledge as the goal of enquiry. While all of the continental rationalists meet one or more of these criteria, this is arguably the consequence of a deeper tie that binds them together—that is, a metaphysical commitment to the reality of substance, and, in particular, to substance as an underlying principle of unity. (shrink)

The dissertation examines the nature and epistemic implications of epistemic source circularity. An argument exhibits this type of circularity when at least one of the premises is produced by a belief source the conclusion says is legitimate, e.g. a track record argument for the legitimacy of sense perception that uses premises produced by sense perception. In chapter one I examine this and several other types of circularity, identifying relevant similarities and differences between them. In chapter two I discuss the differences (...) between internalist and externalist analyses of justification. I examine in detail foundationalist and non-foundationalist versions of internalism, and go on to consider how one might characterize externalism: either negatively, by denying particular internalist theses, or positively, in terms of a theory offering different conditions for justification. I discuss the views of reliabilist foundationalists at length. In chapter three I present the internalist objection to externalism that the latter mistakenly permit one to be justified in believing the conclusion of an epistemic source circular inference. I explain the externalists' response that it is not in virtue of their externalism that they permit epistemic source circularity but rather their foundationalism; thus, internalist foundationalists must permit epistemic source circularity as well. I evaluate the positions of several internalists, most of them explicitly foundationalists, and argue that they too cannot avoid permitting epistemic source circularity. In the final chapter I consider whether such circularity is vicious, even though both internalist and externalist foundationalists permit it. I argue that one can sustain an objection to epistemic source circularity by imposing a non-question-begging requirement on justification and explain how respecting this requirement leads one to a non-foundationalist view. I conclude by considering the objection that question-begging leads to a certain arbitrariness in belief formation that should give the foundationalist pause when it comes to determining, at the beginning of inquiry, which beliefs are justified and which are not. The dissertation is primarily concerned with making clear the possible skeptical and non-skeptical positions one can take towards epistemic source circularity. I do not argue for the truth of a particular metaepistemology. (shrink)

I offer a novel reading in this dissertation of René Descartes’s (1596–1650) skepticism in his work Meditations on First Philosophy (1641–1642). I specifically aim to answer the following problem: How is Descartes’s skepticism to be read in accordance with the rest of his philosophy? This problem can be divided into two more general questions in Descartes scholarship: How is skepticism utilized in the Meditations, and what are its intentions and relation to the preceding philosophical tradition? -/- I approach the topic (...) from both a historical and a text-based analysis, combining textual and contextual research. I examine Descartes’s skepticism against two main traditions in the historical analysis: philosophical skepticism and Aristotelian Scholasticism. I argue that skepticism in the Meditations is intended to oppose and upheave both Scholasticism and skepticism. The intended results of the work are not merely epistemological but also metaphysical and even ethical. Furthermore, these ambitions cannot be neatly distinguished but merge into each other. -/- The third historical context against which the skeptical meditations are examined is the literary genre of meditative exercises, particularly from the 1500–1600’s, which, while religiously and spiritually oriented, likewise provided the practitioner with an enlightened understanding of self-knowledge and their cognitive place in the world on the way to closer spiritual proximity to God. I argue by this reading that the skepticism of the Meditations is an attentive, meditational cognitive exercise that is not merely instrumental and methodological but is to have a genuine and serious (psychologically real) effect on our thinking. The skeptical meditation is not simply a theoretical thought experiment but is to be seriously practiced as a transformative process of reorienting one’s cognitive framework to discover truth, certainty, and a way to a happy, tranquil, and virtuous life. -/- I offer a close reading in the textual analysis of the first three meditations of the Meditations. I argue that the meditative skepticism employed in the work does not reject the previous beliefs but suspends judgment on them, withdrawing assent until further evidence can be found. I introduce a new term into Descartes scholarship in this analysis, based on the terminology of ancient skepticism: Cartesian epochē (gr. epochē, suspension, withdrawal). Instead of rejecting previous beliefs or assenting to the probably false, the skeptical procedure of the Meditations is argued to emulate in important ways the suspension of judgment on equally balanced reasons in ancient Pyrrhonian skepticism. Novel interpretations are presented along the way of the will’s freedom, of the First Meditation’s skeptical scenarios, of the cogito, and of the vindication of metaphysical certainty, as well as a clarification of the Cartesian Circle problem. -/- Reinterpreting the relation of Descartes’s skepticism to the preceding historical and literary traditions leads to a new look at the skeptical method itself. Presenting a new interpretation of skepticism in the Meditations leads at the same time to a new look at its relation to the historical context. The two research questions are, then, intrinsically tied together. -/- My focus in the study is on the Meditations, but I also reference and discuss Descartes’s other philosophical works, as well as his correspondence, when necessary. (shrink)

In this paper, I join the so-called voluntarism debate on Descartes’s theory of will and judgment, arguing for an indirect doxastic voluntarism reading of Descartes, as opposed to a classic, or direct doxastic voluntarism. More specifically, I examine the question whether Descartes thinks the will can have a direct and full control over one’s suspension of judgment. Descartes was a doxastic voluntarist, maintaining that the will has some kind of control over one’s doxastic states, such as belief and doubt. According (...) to a long-held reading, the control that the will has over doxastic states in Descartes’s theory is direct; the doxastic states are affected by the mere act of will. This reading is called direct doxastic voluntarism (DDV), or direct voluntarism (DV) for short, and it states that we are capable of assenting, rejecting and suspending a judgment based only on our will to do so. Thus, these actions would be utterly and merely volitional. DV can be divided into two further positions, direct positive voluntarism (+DV) and direct negative voluntarism (-DV). Direct positive voluntarism deals with the act of forming judgments, maintaining that one can accept or deny a proposition wilfully and either merely believe or not believe something voluntarily. Direct negative voluntarism deals with the suspension of judgment, maintaining that it can likewise be accomplished by a simple act of will. However, I support an alternate account of Descartes’s voluntarism, which is called indirect doxastic voluntarism (IDV), or indirect voluntarism (IV) for short. By this account, the will is capable of affecting a doxastic state indirectly by making one concentrate on essential tasks for forming that state, such as gathering up and paying attention to strong reasons and evidence. IV is also possible to divide into indirect positive voluntarism (+IV) and indirect negative voluntarism (-IV). Per indirect positive voluntarism the will needs to pay attention to reasons for accepting or denying some proposition. Likewise, by indirect negative voluntarism, in order to suspend judgment the will needs to direct this attention to the reasons for doubt. By attending to these reasons, the will also comes face-to-face with its own freedom. This feeling of freedom can be described as affectivity of the reasons for belief (assent) and doubt (suspension). (shrink)

Spinoza rarely refers to art. However, there are extensive resources for a Spinozist aesthetics in his discussion of health in the Ethics and of social affects in his political works. There have been recently been a few essays linking Spinoza and art, but this essay additionally fuses Spinoza’s politics to an affective aesthetics. Spinoza’s statements that art makes us healthier (Ethics 4p54Sch; Emendation section 17) form the foundation of an aesthetics. In Spinoza’s definition, “health” is caused by external objects that (...) maintain our power to act in a variety of ways. Humans need such objects because our complex bodies constantly lose or consume many parts necessary to our overall functioning. Notably, Spinoza defines humans’ bodies through this complexity (2p13Sch), so health as maintenance of complexity is a distinctly human endeavor. Further, while art is not the only healthy activity, I argue that art is a particularly potent cure, which explains Spinoza’s otherwise opaque comment that music can cure melancholy (by which he meant a near-total inability to act, akin to death). Rather than only causing frivolous pleasures, art may be as essential to human flourishing as are other human beings in general; other people are “most useful” because of the variety of actions they make possible (4p35Cor & Sch1). Art’s production of a dizzying variety of affects is likewise most useful for health. -/- Having established how art in general affects the individual, I then explain the role of artists in shaping social groups. Artists use vivid and highly charged affective techniques, as do political sovereigns and religious prophets (TTP chapters 1-2 & 15-16). However, sovereigns and prophets are concerned exclusively with “morality,” defined by Spinoza as the use of affects (primarily based on fear and hope) to produce “obedience” in the generic multitude or people at large. An artist, however, rarely causes affects in the whole nation, affecting instead only a smaller niche or “sub-genre” of people. The affects produced in this group are also not identical to those used by sovereigns, since artists do not primarily deploy sad affects of hope and fear but instead use a wide variety of joyful affects. Further, in Spinoza’s analysis of ceremonies (TTP chapter 5), we see how small groups exposed to repeated ceremonies or social practices eventually develop new strengths which they lacked before. Repeated exposure to shared aesthetic “ceremonies” (e.g., live music performances) of the same sub-genre will over time create the capacity of new powers in the sub-genre of people, which distinguishes them from the masses. Spinoza says sovereigns forge a “second nature” for the generic people through affects; we can then affirm that smaller groups exposed to a distinct sub-genre of art can acquire a new “third nature” which will contain unique powers extending beyond healthy maintenance of their existing bodies. That is, art in general is necessary to flourish and remain whole (maintaining health), but it can also occasionally expand what one is to unforeseen heights (through specific artistic sub-genres). (shrink)

This dissertation examines Rene Descartes' view of certainty and defends the view that Cartesian certainty is possible. The first half of the dissertation includes an interpretation of Descartes' epistemology as well as an examination of other interpreters' readings. The second half of the dissertation is a defense of the claim that Cartesian certainty of a particular kind is possible; it includes a variety of contemporary objections and replies in defense of the possibility of certainty.

The problem of philosophical skepticism relates to the difficulty involved in underwriting the claim that we know anything of spatio-temporal reality. It is often claimed, in fact, that proper philosophical scrutiny reveals quite the opposite from what common sense suggests. Knowledge of external reality is thought to be even quite obviously denied to us as a result of the alleged fact that we all fail to know that certain skeptical scenarios do not obtain. A skeptical scenario is one in which (...) we have neurological occurrences just like any normal situation in which we actually perceive spatio-temporal objects, but where we are deceived in some sense as a result of the manipulation of our brains from some outside source. In this work I attempt to address the problem of philosophical skepticism by claiming that most of us are able to come to know plenty about external reality, since we can come to realize that a certain philosophical theory of perception is correct. The theory I have in mind is what I call a non-cognitive theory of perception. According to this view, perceptual experience is defined by continuous, sensitive behavioral interaction with spatio-temporal objects of the appropriate size, shape, hardness, speed, etc. Knowing that this theory of perception is correct is equivalent to knowing that we know plenty about external reality. This is ultimately because by knowing that a non-cognitive theory of perception is true, we know that any skeptical scenario must fail to obtain. The structure of the work proceeds by first discussing the significance of the problem of philosophical skepticism in some detail. Chapter 1 lays out how the problem does indeed forcefully arise if it is conceded that we fail to know that the skeptical scenarios fail to obtain. Chapter 2 develops the sort of view of our epistemological situation that falls out of accepting without qualification that the problem exists. Chapter 3 examines and criticizes certain popular responses to the skeptical problem. The main goal of these first three preliminary chapters is to indicate that once it is admitted that we fail to know that the skeptical scenarios fail to obtain, the problem of philosophical skepticism forcefully presents itself. Chapter 4, however, attacks the idea that we fail to know that the skeptical scenarios fail to obtain. In this chapter I argue that this idea is wedded to the position that a certain theory of perception is correct. The theory in question is what I call a conjunctive theory of veridical experience. According to this view, normal experience of spatio-temporal objects occurs when a subject has a certain perceptual experience, and that experience also happens to match up with and/or be satisfied by what is really the case. Only when a theory of this sort is assumed, I argue, is the claim that we fail to know that the skeptical scenarios fail to obtain found to be obvious. In chapter 5 I argue that, in fact, a non-cognitive theory, rather than a conjunctive theory, is the correct view to maintain. In the final chapter 6 I develop the epistemological position that falls out of accepting a non-cognitive theory. (shrink)

Central to Descartes’ philosophy is a view about immutable essences and eternal truths. After mentioning a Platonist account of recollection in Meditation V, Descartes declares that the ideas we have of mathematical notions “are not my invention but have their own true and immutable natures” (AT VII, 64/CSM II, 44).Descartes claims that other important philosophical notions, such as God, mind, body, and human free will (AT VII, 68; AT VIII-2, 348; AT III, 383; AT VII, 433, respectively), also have immutable (...) natures or essences. Although Descartes says a good many things about this view, nowhere does he offer definitive doctrine on the matter, and in fact frequently confuses his reader with apparently inconsistent pronouncements about immutable natures and eternal truths. In this essay, I focus on the immutable natures and propose a solution to two of the main problems associated with Descartes’ position, the metaphysical status of immutable natures and the purported indivisibility of their existence as ideas in the mind. (shrink)