Im Alltag äußern wir nicht nur Aussagen darüber, wie die Welt tatsächlich beschaffen ist, sondern auch darüber, was notwendigerweise oder möglicherweise der Fall ist. Doch worin ist die Wahrheit solcher sogenannten Modalaussagen fundiert? Auf diese Frage gibt Gottfried Wilhelm Leibniz bereits in der Frühen Neuzeit eine höchst interessante Antwort: Für ihn sind modale Wahrheiten im Intellekt Gottes fundiert. Diese Modalitätskonzeption analysiert Sebastian Bender in der vorliegenden Studie auf systematisch informierte Weise. Dabei kommt er zu folgenden Ergebnissen: Erstens vertritt Leibniz, anders (...) als häufig angenommen, eine nicht-reduktionistische Metaphysik der Modalität– Modales wird von ihm also nicht auf etwas Nicht-Modales reduziert. Zweitens ist Leibniz' Theorie der Modalität kombinatorisch geprägt. Drittens repräsentieren mögliche Welten für Leibniz nicht alles metaphysisch Mögliche. Gott kann im Prinzip auch Ansammlungen von Substanzen erschaffen, die keine Welten konstituieren. Viertens schließlich ist das für Leibniz zentrale Prinzip des zureichenden Grundes kontingent und nicht, wie häufig vorausgesetzt, notwendig. Auf diese Weise gelingt es Leibniz, seinen Rationalismus mit seinem Theismus zu verbinden. (shrink)

Leibniz repeatedly states that there is a very close connection between reflection and rationality. In his view, reflective acts somehow lead to self-consciousness, reason, the knowledge of necessary truths, and even to the moral liability of the respective substances. Whereas it might be relatively easy to see how reflective acts lead to self-consciousness, it is much harder to understand how they are connected to rationality. Why should a substance which is able to produce reflective acts therefore be rational? How can (...) the having of reflective acts be responsible for the substance’s ability to reason correctly and to acquire knowledge of necessary and eternal truths? The aim of my paper is to understand better the required mechanisms and to make thus conceivable Leibniz’s bold claim that reflective acts lead to rationality. In order to accomplish this, I will proceed in three steps. First, I will specify what kind of self-consciousness is, according to Leibniz, produced by reflective acts. A substance must recognize itself as a unitary substance bearing perceptions. Second, I will argue that this type of self- consciousness can be seen as the basis for the ability to form judgments. This is possible because the subject-predicate structure of judgments is mirrored by the ontology of substances and their modifications. Third, I will point out that, together with the idea of identity (which we also acquire by reflection), the combination of judgments allows us to make inferences. This ability, in turn, is sufficient for rationality. Thus, I can explain how reflective acts and rationality are connected with each other. (shrink)

The Aristotelian account of change—according to which no individual can survive a change of species because an individual's essence is, at least in part, determined by its species membership—remains popular in the seventeenth century. One important, but often overlooked dissenting voice comes from Anne Conway. Unlike many of her contemporaries, Conway firmly rejects the Aristotelian account of change. She instead endorses the doctrine of Radical Mutability, the view that a creature can belong to different species at different times. A horse, (...) for example, can gradually become a human being and yet remain the same individual. Why, though, is Conway so opposed to the prima facie appealing Aristotelian account of change? This paper claims that she levels two arguments against this account which have been largely neglected so far. First, she argues that there could be no causal interaction between creatures belonging to different species with distinct essences, because cause and effect would be too dissimilar in that case. Second, Conway argues that the Aristotelian model is inconsistent with divine goodness because it allows for the annihilation of creatures and because it imposes arbitrary restrictions on the capacity of creatures to improve. (shrink)

Descartes famously espouses modal voluntarism, the doctrine that God freely creates the eternal truths. God has chosen to make it true that two plus two equals four, for instance, but he could have chosen otherwise. Why, though, does Descartes endorse modal voluntarism? Many commentators have noted that he regularly appeals to divine omnipotence to justify his doctrine. This strategy is usually thought to be unsuccessful, however, because it seems to presuppose—question-beggingly—that the eternal truths are in the scope of God’s power. (...) This paper argues that Descartes’s appeal to divine omnipotence has more going for it than meets the eye. Like many other medieval and early modern philosophers, Descartes assumes that God has the power to control everything that remains unfixed by his own essence. At the same time, though, he denies that the eternal truths are fixed by, or grounded in, the divine essence. The combination of these two commitments leads to modal voluntarism. The paper also argues that the Principle of Sufficient Reason (PSR) may play an important role in the reasoning that leads Descartes to endorse modal voluntarism. This is surprising, given that the PSR appears to be deeply at odds with modal voluntarism. (shrink)

Is Hume a liberal or a conservative? Hume scholars are divided over this question. This paper rejects the widespread reading of Hume as a conservative and argues that Hume is a liberal, even though his version of liberalism is fundamentally different from Lockean liberalism. Hume differs from Locke in that he attempts to justify a liberal political order without appealing to natural rights or a social contract. Instead, his liberalism is deeply rooted in his empiricist epistemology and in his sentimentalist (...) ethics. Because the starting point of Hume’s political theory is his analysis of the nature of human beings as they actually are, he ends up with a liberal theory that is less idealizing than Lockean liberalism. He thus defends what I call a non-ideal liberalism. The paper also argues that Hume’s non-ideal liberalism does not rule out political ideals altogether. Such ideals, however, must be derived in such a way that they do not violate his empiricist principles. (shrink)

The Principle of Sufficient Reason —the principle that everything has a reason—plays a central role in Leibniz’s philosophical system. It is rather difficult, however, to determine what Leibniz’s attitude towards the modal status of the PSR is. The prevailing view is that Leibniz takes the PSR to be true necessarily. This paper develops a novel interpretation and argues that Leibniz’s PSR is a contingent principle. It also discusses whether a merely contingent PSR can do the metaphysical heavy lifting that Leibniz (...) aims for. The paper shows that, despite appearance to the contrary, this is possible. In a nutshell, the argument is that the only possible PSR violation Leibniz allows for is God’s creation of a suboptimal world; there is no Leibnizian possible world, though, which intrinsically violates the PSR. Despite its contingency, then, Leibniz’s PSR is modally robust enough to serve as a foundational principle of his metaphysics. (shrink)

Hume is an avowed critic of contractarianism. He opposes the idea that a legitimate government is based on an ‘original contract’ or on the consent of those who are governed. Most scholars assume, though, that his criticisms apply only to a limited range of contractarian theories, namely to theories according to which actual contractors reach an actual agreement. Theories on which the agreement in question is understood in hypothetical or counterfactual terms, however, are oftentimes seen as being compatible with Hume’s (...) views. Against such interpretations, this paper shows that Hume rejects all contractarian theories, including hypothetical ones. It argues, first, that Hume employs a so far unacknowledged empiricist debunking strategy against contractarianism; if successful, this strategy undermines all variants of contractarianism. Second, it shows that the Humean conception of the state of nature (a topic that has received virtually no scholarly attention) is incompatible with hypothetical contractarianism. Finally, it argues that Hume rejects contractarianism in part because he anticipates a line of criticism which nowadays is often leveled against so-called ideal theory. On Hume’s view, the agreements reached by highly idealized contractors are of little relevance to the non-ideal individuals in the actual world. (shrink)

Essences play a central role in Spinoza’s philosophy, not only in his metaphysics, but also in his philosophy of mind, his theory of affects, and his political philosophy. Despite their importance, however, it is surprisingly difficult to determine what exactly essences are for Spinoza. On a widespread reading, the essence of X is nothing but the concept of X. This paper argues against this identification of essences and concepts. Spinozistic concepts are maximally inclusive: the concept of X contains everything that (...) is needed to make X conceivable. The essence of X, in contrast, is more limited in scope and does not include everything that is needed to make X conceivable. Thus, Spinoza avoids the ‘overloading’ of essences and the problems that would ensue. The account developed in this paper has a surprising implication, namely that the essences of non-divine, singular things do not suffice to render these things fully conceivable on Spinoza’s view. Thus, Spinoza breaks with a tradition according to which the essence of a thing states ‘what the thing is.’ As a result, his conception of essence is much further removed from traditional Aristotelian accounts, and from other seventeenth-century accounts, than usually acknowledged. (shrink)

The Principle of the Identity of Indiscernibles —the principle that no two numerically distinct things are perfectly similar—features prominently in Leibniz’s metaphysics. Despite its centrality to his philosophical system, it is surprisingly difficult to determine what modal status Leibniz ascribes to the PII. On many occasions Leibniz appears to endorse the necessity of the PII. There are a number of passages,however, where Leibniz seems to imply that numerically distinct indiscernibles are possible, which suggests that he subscribes to a merely contingent (...) version of the PII. In this paper I attempt to resolve this apparent inconsistency. I argue that Leibniz consistently takes the PII to be necessary and that this view of his shines through even in his correspondence with Clarke. I also show that competing interpretations, on which Leibniz’s PII is contingent, misread a number of crucial passages from this correspondence. (shrink)

Leibniz denies Spinoza’s claim that all possible things actually exist. He also denies necessitarianism, Spinoza’s claim that all truths are necessary truths. Both denials seem plausible. What is surprising, however, is Leibniz’s view that the first claim entails the second, i.e., that the existence of all possible things implies necessitarianism. Why think this? Couldn’t it be that, as a matter of contingent fact, all possible things actually exist? There seems to be no incoherency in claiming both that all possible things (...) actually exist and that fewer things could have existed. In this paper, I explain why Leibniz thought that such a position is indeed inconsistent. My thesis is that the Principle of Sufficient Reason plays a decisive role in his reasoning. Leibniz claims that the non-existence of a thing requires a sufficient reason. He also holds that if all possible things can coexist, such a reason cannot be given. Together these claims rule out a scenario in which all possible things actually exist, but only contingently so. (shrink)

This book re-examines the roles of causation and cognition in early modern philosophy. The standard historical narrative suggests that early modern thinkers abandoned Aristotelian models of formal causation in favor of doctrines that appealed to relations of efficient causation between material objects and cognizers. This narrative has been criticized in recent scholarship from at least two directions. Scholars have emphasized that we should not think of the Aristotelian tradition in such monolithic terms, and that many early modern thinkers did not (...) unequivocally reduce all causation to efficient causation. -/- In line with this general approach, this book features original essays written by leading experts in early modern philosophy. It is organized around five guiding questions: -/- What are the entities involved in causal processes leading to cognition? What type(s) or kind(s) of causality are at stake? Are early modern thinkers confined to efficient causation or do other types of causation play a role? What is God's role in causal processes leading to cognition? How do cognitive causal processes relate to other, non-cognitive causal processes? Is the causal process in the case of human cognition in any way special? How does it relate to processes involved in the case of non-human cognition? -/- The essays explore how fifteen early modern thinkers answered these questions: Francisco Suárez, René Descartes, Louis de la Forge, Géraud de Cordemoy, Nicolas Malebranche, Thomas Hobbes, Baruch de Spinoza, Gottfried Wilhelm Leibniz, Ralph Cudworth, Margaret Cavendish, John Locke, John Sergeant, George Berkeley, David Hume, and Thomas Reid. The volume is unique in that it explores both well-known and understudied historical figures, and in that it emphasizes the intimate relationship between causation and cognition to open up new perspectives on early modern philosophy of mind and metaphysics. (shrink)

This German paper investigates what kinds of abilities Leibniz ascribes to non-human animals and how they differ from the abilities he ascribes to humans. The paper attempts to clarify how the notions of perception, apperception, reflection, and conscientia are related for Leibniz. More specifically, the paper develops a new reading of section four of the Principles of Nature and Grace, which is a much-discussed passage in Leibniz scholarship. It argues for two claims: (i) Leibniz distinguishes between a reflective and a (...) non-reflective kind of apperception. (ii) Leibnizian conscientia is not to be confused with (phenomenal) consciousness, because it includes a reflective element, from which it follows that non-human animals do not have conscientia according to Leibniz. (shrink)

Volume 28, Issue 1, January 2020, Page 204-207.

In this article, I defend the thesis that Leibniz’s rational substances always have higher-order perceptions, even when they are, say, in a dreamless sleep. I argue that without this assumption, Leibniz’s conception of reflection would introduce discontinuities into his philosophy of mind which (given his Principle of Continuity) he cannot allow. This interpretation does not imply, however, that rational beings must be aware of these higher-order states at all times. In fact, these states are often unconscious or ‘small’ (analogous to (...) Leibniz’s famous petites perceptions) and only count as reflections when they become distinct or heightened enough. Reflections thus arise out of ‘petites réflexions’ just as conscious perceptions arise out of petites perceptions. I argue, furthermore, that an analysis of some aspects of Leibniz’s theory of memory shows that he is not only committed to the thesis that rational beings always have higher-order states but that he also accepts it. I conclude by considering whether my interpretation is at odds with Leibniz’s doctrine of transcreation and also whether it has any consequences for which theory of consciousness we should ascribe to Leibniz. (shrink)

Volume 28, Issue 1, January 2020, Page 204-207.

On Berkeley’s immaterialist ontology, there are only two kinds of created entities: finite spirits and ideas. Ideas are passive, and so there is no genuine idea-idea causation. Finite spirits, by contrast, are truly causally active on Berkeley’s view, in that they can produce ideas through their volitional activity. Some commentators have argued that this account of causation is inconsistent. On their view, the unequal treatment of spirits and ideas is unfounded, for all that can be observed in either case are (...) mere patterns of regularity; Berkeley should therefore adopt a full-blown occasionalism and follow Malebranche in holding that God is the only true cause. Other commentators have argued that Berkeley denies the tenet that causes necessitate their effects – that is, the idea that causation involves necessary connection – and that in this way he can avoid inconsistency. This paper argues that Berkeley can subscribe to the thesis that finite spirits are truly causally active without falling into inconsistency, even if it is granted that Berkeleyan causes necessitate their effects. His differing treatment of spirits and of ideas is well founded, since ideas are transparent in a way our notions of spirits are not. (shrink)

In this blog entry, which addresses a broader audience, I wonder what exactly historians of philosophy do and how their work relates to non-historical work in philosophy. In particular, I raise the question why systematic philosophers and historians of philosophy are relatively close to each other. After all, they often publish in the same journals and work at the same departments. This is surprising, given that asking what X is seems to be rather different from asking what some person a (...) few hundred (or thousand) years ago thought what X is. I argue that systematic philosophers and historians of philosophy are so close because their work proceeds in a similar way. To be sure, they have very different starting points. Historians of philosophy may start, for instance, with a number of texts from one and the same author which appear to be in conflict. Systematic philosophers, in contrast, may start with a set of intuitions which seem to contradict one other. The way historians of philosophy and systematic philosophers operate upon those different starting points, however, is very similar. This explains at least in part, I maintain, why they are a lot closer than is the case in many other disciplines. (shrink)

Early modern philosophers took the phenomena of causation and cognition to be closely related. United in their opposition to Aristotelian accounts of cognition, they developed a wide range of competing theories to explain which causal processes lead to cognitions. Somewhat surprisingly, some early modern authors also made cognition a requirement for causation, on the assumption that every cause needs to cognize its effect. This introductory chapter explores both directions of explanation—from causation to cognition and vice versa—and surveys the various early (...) modern approaches to causation and cognition. (shrink)

Leibniz defends two apparently inconsistent doctrines. On the one hand, he holds that substances are independent entities and that God can, at least in principle, create any possible substance whatsoever no matter what else he creates. On the other hand, Leibniz insists that some possible substances are incompossible with one another and thus cannot coexist. I first discuss three attempts of dealing with this tension in Leibniz’s work that have recently been made in the literature: the logical approach, the lawful (...) approach, and McDonough’s tiling approach. I conclude that none of them solves the problem satisfactorily. I then argue that a modified version of the lawful approach, which also takes into account some of the insights of the two other options, is the most promising strategy. I believe that it is crucial to realize that it is, at least in principle, in God’s power to co-create incompossible substances. I do not take this to imply, however, that such substances can coexist. Since coexistence requires being in the same world, and because not all collections of possible substances are worlds in Leibniz’s sense, I argue that co-creation does not entail coexistence. Thus in order to get clear on Leibniz’s conception of compossibility, I suggest that we must better understand what a possible world is for Leibniz. What does it mean, then, for a collection of possible substances to form a world? I argue, first, that all complete concepts of the relevant possible substances need to have the same laws inscribed in them this is in line with some versions of the lawful approach). In addition, I argue that every complete concept in the relevant collection must also involve the concept of every other substance in the collection. Moreover, I maintain that these two requirements are not reducible to each other and that they are individually necessary and only jointly sufficient for a collection of substances to form a world. Only substances whose complete concepts fulfill both conditions can coexist and thus be compossible. (shrink)