Gottfried Wilhelm Leibniz (1646–1716) was one of the great thinkers of the seventeenth and eighteenth centuries and is known as the last “universal genius”. He made deep and important contributions to the fields of metaphysics, epistemology, logic, philosophy of religion, as well as mathematics, physics, geology, jurisprudence, and history. Even the eighteenth century French atheist and materialist Denis Diderot, whose views could not have stood in greater opposition to those of Leibniz, could not help being awed by his achievement, writing (...) in his Encyclopedia, “Perhaps never has a man read as much, studied as much, meditated more, and written more than Leibniz… What he has composed on the world, God, nature, and the soul is of the most sublime eloquence. If his ideas had been expressed with the flair of Plato, the philosopher of Leipzig would cede nothing to the philosopher of Athens.” (Vol. 9, p. 379) Indeed, Diderot's mood was almost despairing in a remark from another piece, which also has a great deal of truth in it: “When one compares the talents one has with those of a Leibniz, one is tempted to throw away one's books and go die quietly in the dark of some forgotten corner.” More than a century later, Gottlob Frege, who fortunately did not cast his books away in despair, expressed similar admiration, declaring that “in his writings, Leibniz threw out such a profusion of seeds of ideas that in this respect he is virtually in a class of his own.” (“Boole's logical Calculus and the Concept script” in Posthumous Writings , p. 9) The aim of this entry is primarily to introduce Leibniz's life and summarize and explicate his views in the realms of metaphysics, epistemology, philosophical theology, and natural philosophy. (shrink)

Margaret Wilson, who died last year, has been described as the most eminent English-language historian of early modern philosophy of her generation. She was President of the Leibniz Society of North America for four years, from 1986 to 1990. Within this organization she is remembered both for her contributions to Leibniz-studies and for her attention to and support of younger researchers and her governing role in the Society. Her Harvard Ph.D. dissertation on “Leibniz’s Doctrine of Necessary Truth,” written under the (...) supervision of Morton White, was completed in 1965, and she went on to write a number of papers on Leibniz in the late 1960s and early-to-mid 1970s, including “Leibniz and Materialism,” “Confused Ideas” and “Leibniz’s Dynamics and Contingency in Nature,” returning to Leibniz in the late 1980s and early 1990s with such articles as “Compossibility and Law” and “The Phenomenalisms of Leibniz and Berkeley. ” Over the course of her career, Wilson published two books, her dissertation, which appeared in a series issued by Garland in 1990, and Descartes, published by Routledge and Kegan Paul in 1978, as well as more than thirty papers on seventeenth and eighteenth century philosophy, nearly all of which are included in the recent volume from Princeton University Press, Ideas and Mechanism. She held a number of research awards and honorary fellowships, including a Fellowship in the American Academy of Arts and Sciences to which she was elected in 1992. (shrink)

I argue Leibniz could not have been a dualist since his notion of matter is not defined by extension but by mentalistic "primitive passive force." So Leibniz was some kind of idealist. However, Leibniz was neither a phenomenal idealist like Berkeley nor a conceptualist idealist like Hegel. Instead, despite some suggestions in favor of the latter kind of idealism, Leibniz must be regarded as an idealist who admitted extraconceptual considerations irreducible to materialism.

According to Leibniz's late metaphysics, sensory perception represents to us as extended, colored, textured, etc., a world which fundamentally consists only of non-spatial, colorless entities, the monads. It is a short step from here to the conclusion that sensory perception radically misleads us about the true nature of reality. In this paper, I argue that this oft-repeated claim is false. Leibniz holds that in typical cases of body perception the bodies perceived really exist and have the qualities, both primary and (...) secondary, they are perceived to have. At the same time, Leibniz holds that our perceptions of these bodies are accurate representations of the monads from which the bodies result. The contrary thesis — that our body perceptions are misrepresentations of the monads — stems from a misunderstanding of Leibniz's theory of confused concepts and his phenomenalist account of the nature of body. Clarifying these issues will have important consequences for our understanding of Leibniz's idealistic metaphysics and the manner in which that metaphysical theory is meant to support mechanistic science. (shrink)