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Toward the end of 1676 Leibniz met Spinoza a number of times. In one of those meetings Leibniz presented a proof of the possibility of God's existence. In his proof Leibniz presupposed that a proposition is necessarily true only if its truth is either demonstrable or self-evident and that the divine perfections are simple and affirmative qualities. I contend that Leibniz's presuppositions undermine, rather than establish, the necessary existence of 'a God of the kind in whom the pious believe'. My assessment is based upon a consideration of Leibniz's argument in the context of other early papers, works written before the "Discourse on Metaphysics" in 1686.

The revival of Leibniz studies in the past twenty-five years has cast important new light on both the context and content of Leibniz's philosophical thought. Where earlier English-language scholarship understood Leibniz's philosophy as issuing from his preoccupations with logic and language, recent work has recommended an account on which theological, ethical, and metaphysical themes figure centrally in Leibniz's thought throughout his career. The significance of these themes to the development of Leibniz's philosophy is the subject of increasing attention by philosophers and historians. This collection of new essays by a distinguished group of scholars offers an up-to-date overview of the current state of Leibniz research. In focusing on nature and freedom, the volume revisits two key topics in Leibniz's thought, on which he engaged both contemporary and historical arguments. Important contributions to Leibniz scholarship in their own right, these articles collectively provide readers a framework in which to better situate Leibniz's distinctive philosophy of nature and the congenial home for a morally significant freedom that he took it to provide.

Leibniz's mill argument in 'Monadology' 17 is a well-known but puzzling argument against materialism about the mind. I approach the mill argument by considering other places where Leibniz gave similar arguments, using the same example of the machinery of a mill and reaching the same anti-materialist conclusion. In a 1702 letter to Bayle, Leibniz gave a mill argument that moves from his definition of perception (as the expression of a multitude by a simple) to the anti-materialist conclusion. Soon afterwards, in the Preface to the New Essays, Leibniz gave a different mill argument. That argument depends upon there being no arbitrary and inexplicable connections in nature, because God would not create such things. Later, in the 'Monadology', Leibniz again used the mill example in arguing against materialism. That passage too, I argue, uses an argument from inexplicability rather than from Leibniz's definition of perception.

Unlike most of the other great philosophers, Leibniz never wrote a magnum opus, so his philosophical correspondence is essential for an understanding of his views. This collection of new essays by preeminent figures in the field of Leibniz scholarship is the most thorough account of Leibniz's philosophical correspondence available. It illuminates his philosophical views and pays due attention to the dialectical context in which the relevant passages from the letters occur.

In the main article on Leibniz, it was claimed that Leibniz's philosophy can be seen as a reaction to the Cartesian theory of corporeal substance and the necessitarianism of Spinoza and Hobbes. This entry will address this second aspect of his philosophy. In the course of his writings, Leibniz developed an approach to questions of modality—necessity, possibility, contingency—that not only served an important function within his general metaphysics, epistemology, and philosophical theology but also has continuing interest today. Indeed, it has..

READING LEIBNIZ. Context of Leibniz's philosophy -- Difficulties of reading Leibniz -- Using this book -- GOD AND THE BEST POSSIBLE WORLD. Two principles of knowledge -- The existence of god -- The nature of God -- The best of all possible worlds -- SUBSTANCES. Substance in early modern philosophy -- The simplicity and unity of substance in Leibniz -- Substances as points of view on the universe -- Interaction and pre-established harmony -- RATIONAL MINDS. Minute perceptions and levels of awareness -- Necessary truths and innate ideas -- Knowledge -- identity and choice -- LEIBNIZ'S PHILOSOPHY AND LEIBNIZ AS PHILOSOPHER .

I consider Leibniz's thoughts about Hobbes's materialism, focusing on his less-discussed later thoughts about the topic. Leibniz understood Hobbes to have argued for his materialism from his imagistic theory of ideas. Leibniz offered several criticisms of this argument and the resulting materialism itself. Several of these criticisms occur in texts in which Leibniz was engaging with the generation of British philosophers after Hobbes. Of particular interest is Leibniz's correspondence with Damaris Masham. Leibniz may have been trying to communicate with Locke, but ended up discussing Masham's version of the argument for materialism that Leibniz attributed to Hobbes.

That Leibniz finds the philosophy of Spinoza horrifyingly wrong is obvious to anyone who reads Leibniz’s work; that Leibniz finds Spinozism so seductive that his own system is in danger of collapsing into it is less obvious but, I believe, equally true. The difference here is not so much between an exoteric and an esoteric philosophy suggested by Russell2 but between a thorough-going rationalism on the part of Spinoza and Leibniz’s “mitigated rationalism” – mitigated by the exigencies of his orthodox Christianity. In other words, it is Leibniz’s traditional view of the nature of God and his creatures that leads him to abhor Spinoza’s vision, while his own commitment to a number of principles and ideas pushes him to rationalism. And if Kant is right that the mind naturally desires a system, then Leibniz ought to see the Spinozistic consequences of many of his philosophical principles. Of course, there is nothing new in saying that the God of Spinoza and the God of Leibniz are fundamentally different, but I believe that if we focus on Leibniz’s critique of Spinoza’s account of the nature of God and a constellation of related concepts, we can come to a deeper understanding of the thought of both philosophers.

Leibniz's predicate-in-notion principle and some of its alleged consequences, by C. D. Broad.--On Leibniz's metaphysics, by L. Couturat.--Philosophical reflections of Leibniz on law, politics, and the state, by C. J. Friedrich.--The root of contingency, by E. M. Curley.--Monadology, by M. Furth.--Individual substance, by I. Hacking.--Leibniz on plenitude, relations, and the "reign of the law," by J. Hintikka.--Leibniz's theory of the ideality of relations, by H. Ishiguro.--Leibniz and Spinoza on activity, by M. Kneale.--Leibniz and Newton, by A. Koyré.--Plenitude and sufficient reason in Leibniz and Spinoza, by A. O. Lovejoy.--Leibniz on possible worlds, by B. Mates.--Recent work on the philosophy of Leibniz, by B. Russell.--On Leibniz's explication of "necessary truth," by M. D. Wilson.--Bibliography (p. [421]-425).