I argue that Plato believes that the soul must be both the principle of motion and the subject of cognition because it moves things specifically by means of its thoughts. I begin by arguing that the soul moves things by means of such acts as examination and deliberation, and that this view is developed in response to Anaxagoras. I then argue that every kind of soul enjoys a kind of cognition, with even plant souls having a form of Aristotelian (...) discrimination (krisis), and that there is therefore no completely unintelligent, evil soul in the cosmos that can explain disorderly motions; as a result, the soul is not the principle of all motion but only motion in the cosmos after it has been ordered by the Demiurge. (shrink)

The concept of self-motion is not only fundamental in Aristotle's argument for the Prime Mover and in ancient and medieval theories of nature, but it is also central to many theories of human agency and moral responsibility. In this collection of mostly new essays, scholars of classical, Hellenistic, medieval, and early modern philosophy and science explore the question of whether or not there are such things as self-movers, and if so, what their self-motion consists in. (...) They trace the development of the concept of self-motion from its formulation in Aristotle's metaphysics, cosmology, and philosophy of nature through two millennia of philosophical, religious, and scientific thought. This volume contains "Self-Movers" (David Furley), "Aristotle on Self-Motion" (Mary Louise Gill), "Aristotle on Perception, Appetition, and Self-Motion" (Cynthia Freeland), "Self-Movement and External Causation" (Susan Sauvé Meyer), "Aristotle on the Mind's Self-Motion" (Michael Wedin), "Mind and Motion in Aristotle" (Christopher Shields), "Aristotle's Prime Mover" (Aryeh Kosman), "The Transcendence of the Prime Mover" (Lindsay Judson), "Self-Motion in Stoic Philosophy" (David Hahm), "Duns Scotus on the Reality of Self-Change" (Peter King), "Ockham, Self-Motion, and the Will" (Calvin Normore), and "Natural Motion and Its Causes: Newton on the 'Vis Insita' of Bodies" (J. E. McGuire). Originally published in 1994. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905. (shrink)

This book is an examination of the metaphysical systems of Margaret Cavendish and Anne Conway, who share many superficial similarities. By providing a detailed analysis of their views on substance, monism, self-motion, individuation, and identity over time, as well as causation, perception, and freedom, it demonstrates the interesting ways in which their accounts differ. Seeing their systems in tandem highlights the originality of each philosopher. In addition to providing the details of their metaphysical views, the book also shows (...) how they put these views to use: for Cavendish in grounding her natural philosophy and for Conway in developing her theodicy. The account of Cavendish is more naturalistic than current interpretations. It argues that God plays no substantive role in Cavendish’s philosophy. The book provides an account of Cavendish’s matter and her biological holism. It shows how sensitive and rational matter are expressed differently in different natural kinds. It provides the first account of Cavendish’s views on individuation and identity over time and a detailed account of her views on causation, arguing that nature is the only principal cause. The book also provides an account of Conway’s spiritual substance, arguing that it is a unique type of substance. It discusses Conway’s two types of motions and causation. In addition, a detailed account of her view of motion as a mode of body, and how it is transferred, is provided. Finally, the book concludes that Conway’s metaphysics and morality are inseparable and that she holds a type of perfectionism. (shrink)

What is Aristotle's considered view of animal self-motion? According to several scholars, Aristotle ends up rejecting this very notion as a result of his criticism of Plato's theory of a self-moving soul. Contrary to this still widespread assumption, the present study argues that his critical engagement with Plato is not confined to negative results, but achieves largely positive outcomes, which add up to a rich and nuanced picture of self-motion. Ferro makes his case by offering (...) a novel reading of a handful of controversial passages from De Anima and Physics VIII, where Aristotle reacts to three aspects of Plato's theory of self-motion: the claim that soul itself is a self-mover, the assumption that self-movers enjoy strong causal autonomy, and the link between motion, desire and soul partition. Through a careful reading of the relevant passages, which does justice to their proper context and significance, Ferro shows that Aristotle's critical re-appropriation of self-motion results in a largely coherent doctrine with major repercussions for Aristotelian psychology and philosophy of nature. (shrink)

Iamblichus' theory of self-motion has to be pieced together from various texts and passing remarks. Ever since Aristotle's critique, Plato's concept of the self-motive soul was felt to be problematic. Taking his lead from Plotinus, Iamblichus counters Aristotle's criticism by claiming that true self-motion transcends the opposition between activity and passivity. He moreover argues that it does not involve motion that is spatially extended. Hence it is non-physical. Primary self-motion is the reversion (...) of the soul to itself, by which the soul constitutes itself, i.e. imparts life to itself. This motion is located at the level of essence or substance. The bestowal of life upon the body derives from this fundamental motion. As a result, animals are derivatively self-motive. Secondary self-motions are acts of thought in the broad sense. Contrary to the unmoved motion of intellect, the self-motion of the soul is not beyond time. This somehow fits Iamblichus' theory of the "changing self''. Iamblichus anticipates much of the later Platonic accounts of self-motion. (shrink)

This paper explores the theory of freedom that Emilie du Châtelet advances in her essay “On Freedom.” Using contemporary terminology, we can characterize this theory as a version of agent-causal compatibilism. More specifically, the theory has the following elements: (a) freedom consists in the power to act in accordance with one’s choices, (b) freedom requires the ability to suspend desires and master passions, (c) freedom requires a power of self-motion in the agent, and (d) freedom is compatible with (...) moral necessity but not with physical necessity. While these elements may at first appear disparate, the paper shows that they fit together quite well. The resulting theory is a surprising combination of doctrines that appear to be based on Samuel Clarke’s libertarian account of free will and doctrines that are reminiscent of the compatibilist accounts of John Locke, Anthony Collins, Gottfried Leibniz, and Thomas Hobbes. (shrink)

Nature, according to Cavendish, has “an Infinite Natural power, that is, a power to produce infinite effects in her own self, by infinite changes of Motions.” While Cavendish mentions powers with respect to human beings, medicines, occasional causes, and other entities, these powers are really just the power of self-moving matter to cause changes in the world. This chapter examines why Cavendish attributes the power of self-motion to matter, what this power is, how it arose, how (...) it is enacted, and its limitations. In doing so, it discusses her views on causation, perception, and motion, and argues that motion is not reducible to change in mereological facts. (shrink)

It is well known that Aristotle tries to make room for self-motion – an idea he inherits to some extent from Plato – within his other commitments to causal determinism while at the same time modifying the idea. However, one argument in Physics VII 1 seems to pose a problem for the bare possibility of self-motion; in it he seems to argue that everything that moves must be moved by something else. The text in which this (...) argument appears is itself vexed on a number of fronts, because it is not clear how Physics VII fits with the rest of the Physics, and also because there are two distinct manuscript traditions for Physics VII. So the argument in Physics VII 1 has not been adequately taken into account in discussions of self-motion. I argue for a new and charitable reading of Aristotle’s Physics VII 1 α241b35-242a49 / β241b25-242a15. I show that the argument is compatible with Aristotle’s endorsements of self-motion; I defend the argument’s most controversial premise; and I argue that my reading has some useful implications for understanding Aristotelian self-motion. (shrink)

Every thing that moves is caused to move by something else. Yet there are things that move themselves. How does Aristotle square those two commitments? This paper helps to answer that question. One argument in Physics VII 1 seems to pose a problem for the bare possibility of self-motion; in it he seems to argue that everything that moves must be moved by something else. The text in which this argument appears is itself vexed on a number of (...) fronts, because it is not clear how Physics VII fits with the rest of the Physics, and also because there are two distinct manuscript traditions for Physics VII. I argue for a new and charitable reading of Aristotle’s Physics VII 1 α241b35-242a49 / β241b25-242a15. I show that the argument is compatible with Aristotle’s endorsements of self-motion; I defend the argument’s most controversial premise; and I argue that my reading has some useful implications for understanding Aristotelian self-motion. Unqualified self-motion (where just the whole of A moves the whole of A) is impossible, for Aristotle. (shrink)

In this paper, I argue that Plato conceives self-motion as non-spatial in Laws X. I demonstrate this by focusing on the textual evidence and by refuting interpretations according to which self-motion either is a specific type of spatial motion or is said to require space as a necessary condition for its occurrence. Moreover, I show that this non-spatial understanding differs from the identification of the soul’s motion with locomotion in the Timaeus. Consequently, I provide (...) an explanation for this difference between the Timaeus and Laws X by considering developmentalist and contextualist viewpoints. (shrink)

Etienne Gilson once observed that Aristotle never had a notion of "life" for, if he was not a mechanist, still less was he a vitalist. Gilson's point was, of course, that Aristotle did not consider life to be some sort of internal force, nor was he prepared to reduce life to mechanical motions. Aristotle avoided both the vitalist and mechanist extremes in his distinctive conception of life as the proper activity of those things which have within themselves a principle of (...) their own movement. Few concepts are more central to Aristotle's understanding of the cosmos than self-motion and few are more difficult to grasp. Certainly, this idea has a very long history associated with the development of biology within the Aristotelian tradition as well as with the study of physical motion in general. Further, this distinction between the moving and the self-moving has played an important role in the development of natural theology among Christian and Islamic thinkers of the Middle Ages. Clearly, this is an idea deserving close study both in the works of Aristotle as well as in the tradition to which those works gave rise. In this context, the essays collected by Gill and Lennox are a most welcome contribution to research on the Aristotelian tradition. (shrink)

Argues that Descartes mistook the sense of 'motion' intended by Aristotle in the latter's definition of life as the capacity for self-motion. Descartes' arguments against Aristotelian soul-as-life-principle consequently commit the 'straw man' fallacy.

The visual system is a source of sensory information that perceives environmental stimuli and interacts with other sensory systems to generate visual and postural responses to maintain postural stability. Although the three sensory systems; the visual, vestibular, and somatosensory systems work concurrently to maintain postural control, the visual and vestibular system interaction is vital to differentiate self-motion from external motion to maintain postural stability. The visual system influences postural control playing a key role in perceiving information required (...) for this differentiation. The visual system’s main afferent information consists of optic flow and retinal slip that lead to the generation of visual and postural responses. Visual fixations generated by the visual system interact with the afferent information and the vestibular system to maintain visual and postural stability. This review synthesizes the roles of the visual system and their interaction with the vestibular system, to maintain postural stability. (shrink)

Nature, according to Cavendish, has “an Infinite Natural power, that is, a power to produce infinite effects in her own self, by infinite changes of Motions” (OEP II.XIV: 220). While Cavendish mentions powers with respect to human beings, medicines, occasional causes, and other entities, these powers are really just the power of self-moving matter to cause changes in the world. This paper examines why Cavendish attributes the power self-motion to matter, what this power is, how it (...) arose, how it is enacted, and its limitations. In doing so, I discuss her views on causation, perception, and motion, and argue that motion is not reducible to change in mereological facts. (shrink)

Margaret Cavendish (1623-1673) argues that when someone throws a ball, their hand does not cause the ball to move. Instead, the ball moves itself. In this chapter, I reconstruct Cavendish’s argument that material things—like the ball—are self-moving. Cavendish argues that body-body interaction is unintelligible. We cannot make sense of interaction in terms of the transfer of motion nor the more basic idea that one body acts in another body. Assuming something moves bodies around, Cavendish concludes that bodies move (...) themselves. Still, Cavendish needs to explain why bodies appear to causally interact even if they do not really. Balls do not usually throw themselves without a helping hand. I offer a new reading of the way bodies respond to their external circumstances in terms of prerequisites or enabling conditions. (shrink)

Leibniz looked upon space as an order of co-existing, independent things which differ from each other. Starting from this approach, we may ask whether two specific differences among given things - e.g. one between A and B, the other between C and D - in their turn differ from one another. Steiner, inspired by Leibniz’s approach, showed that on this second level of abstraction they indeed do. However, if we proceed to a third level of abstraction, comparing differences observed on (...) the second stage of abstraction, we shall no longer detect any material, “palpable” difference. In short: Setting off from the co-existence of different things and analysing whether qualitative, material differences are still evident on a second and a third level of abstraction, we are led to conceive space as a system comprising three qualitatively discernible dimensions. - Concerning time, Leibniz and Steiner looked upon it as an arrangement of items succeeding one another. To understand this requires - if we follow Leibniz − to be able to perceive motion. Now, most moving items are passively driven into motion, depending on an external source which imparts the movement. In contrast to that, an actively moving thing generates within itself the impulse to modify its location in relation to other items. Within the world of sensory perceptions, “organic bodies” ( i.e. organisms) are capable of self-motion to a certain extent. Nonetheless, a true primary self-motion can only be postulated of a completely independent being. Herewith, Leibniz’s approach to the origin of motion and the therein implied up-welling of time reveals itself to be intimately related to lines of thought developed by Plato, Aristotle, and Plotinus - albeit employing completely different terms. (shrink)

The goal of this paper is to analyze the response of John Duns Scotus to Godfrey of Fontaines’s argument against Henry of Ghent’s theory of the will’s self-motion. Godfrey’s argument is that, if the object is assumed to be causa sine qua non and the efficient causality is totally attributed to the will in the act of volition, it would also follow that not only the will’s motion but every motion in nature, such as, for example, (...) the igniting of wood, is a self-motion. In this paper, I will explain that Scotus’s refutation of this argument in Reportatio II, d. 25 is based on his reflection upon the general possibility of self-motion as well as upon the indeterminacy of the will’s act. In doing so, I will show that the development of Scotus’s theory of the will’s motion is closely related to his universalized theory of self-motion. (shrink)

Nel 1726 lo scozzese Walter Bowman intrattenne una corrispondenza con Samuel Clarke su «the power of self-motion», un argomento che Clarke aveva trattato nella sua Demonstration of the Being and Attributes of God. Le due lettere inedite di Clarke, qui presentate, sono parte di quella vasta corrispondenza che il teologo ebbe con filosofi e uomini di lettere dopo la pubblicazione della Demonstration. In questo saggio si ricostruiscono gli argomenti di Clarke, in primo luogo quelli relativi alla dimostrazione dell’esistenza (...) di Dio, evidenziando le influenze di Cartesio, Locke e Newton. I commenti di Bowman, raccolti insieme alle lettere nella sua opera Fugitive Manuscripts, ci aiutano a vedere come Clarke elabori una teoria meccanicistica dell’azione e, come emerge dalle lettere, debba successivamente precisarla ricorrendo a due principi: «Pain is to be avoided and Novelties are to be attended with a sort of curiosity». (shrink)