Marleen Rozemond

Descartes argued that the eternal truths, most prominently the truths of mathematics, are created by God. He was not explicit, however, about the ontological status of these truths. Interpreters have proposed interpretations ranging from Platonism and conceptualism. I argue for an intermediate interpretation: Descartes held they have objective being in God’s mind. In this regard his view was line with a prominent view in Aristotelian scholasticism. I defend this interpretation against objections based on divine simplicity and concerns about causation. I raise questions about the philosophical merit of these objections, but in addition I argue that there is good reason to think that Descartes himself did not think they were problems for the view. Seemingly conceptualist passages in the Principles, I argue, in fact address issues different from the ontological status of the eternal truths.

Donald Rutherford and Jan Cover have put together an excellent volume of essays on Leibniz. Cover and Rutherford begin the volume with a clear and informative introduction, that should serve the less initiated extremely well. They explain the developments of Leibniz scholarship over the course of the twentieth century: the early twentieth century saw a focus on logic, truth and closely connected issues sparked by Russell and Couturat. In the second half of the century the scholarship changed course: issues central to metaphysics and theology became prominent in Leibniz scholarship. Furthermore, in the last 30 years or so, Leibniz scholarship has exemplified a more historical turn in history of philosophy in the English-speaking world. Scholars started to look at the historical background of Leibniz’s thought, and take an interest in the development of Leibniz’s thought over time, and in his very early work, where his thought seems to be quite different from the later, more familiar writings. The present volume exemplifies these newer tendencies.

ABSTRACTThe most prominent early modern argument against materialism is to be found in Descartes. Previously I had argued that this argument relies crucially on a robust conception of substance, according to which it has a single principal attribute of which all its other intrinsic qualities are modes. In the present paper I return to this claim. In Section 2, I address a question that is often raised about that conception of substance: its commitment to the idea that a substance has a single such principal attribute. Gonzalo Rodriguez-Pereyra and Daniel Garber have argued that this claim relies on Descartes's identification of substance with attribute. But I argue that it relies on his view that a substance has a single, unitary nature. In Section 3, I examine the role of this conception of substance in arguments found in Malebranche and Leibniz and compare these arguments with Descartes's.

The Clarke-Collins correspondence was widely read and frequently printed during the 18th century. Its central topic is the question whether matter can think. Samuel Clarke defends the immateriality of the human soul against Anthony Collins’ materialism. Clarke argues that consciousness must belong to an indivisible entity, and matter is divisible. Collins contends that consciousness could belong to a composite subject by emerging from material qualities that belong to its parts. While many early modern thinkers assumed that this is not possible, this correspondence offers an unusually detailed discussion of this issue. Clarke rejects emergentism because real qualities of a composite must be homogeneous with the qualities of the parts. This rejection is based on considerations about the nature of causation. In addition, the disagreement derives in part from a disagreement between Clarke and Collins about the limits of our knowledge.

Locke claimed that God superadded various powers to matter, including motion, the perfections of peach trees and elephants, gravity, and that he could superadd thought. Various interpreters have discussed the question whether Locke's claims about superaddition are in tension with his commitment to mechanistic explanation. This literature assumes that for Locke mechanistic explanation involves deducibility. We argue that this is an inaccurate interpretation and that mechanistic explanation involves a different type of intelligibility for Locke.

Descartes's dualism, and his argument for it, are often understood in terms of the modal notion of separability. I argue that the central notions, substance and real distinction, should not be understood this way. Descartes's well-known argument for dualism relies implicitly on views he spells out in the Principles of Philosophy, where he explains that a substance has a nature that consists in a single attribute, and all its qualities are modes of that nature. The argument relies ultimately on a deeply rationalistic view of substance.

In the Monadology Leibniz has us imagine a thinking machine the size of a mill in order to show that matter can’t think. The argument is often thought to rely on the unity of consciousness and the notion of simplicity. Leibniz himself did not see matters this way. For him the argument relies on the view that the qualities of a substance must be intimately connected to its nature by being modifications, limitations of its nature. Leibniz thinks perception is not a modification of matter because it is active and matter is passive. At the same time, there are traces in Leibniz of a different argument that relies on the notion of internal action, which may involve the notion of simplicity. Critics have sometimes charged that the Mill Argument is an argument from ignorance, but Leibniz was aware of this problem and made clear that he did not make that mistake.

One question that has created controversy among interpreters is just how much is in doubt at the end of the Dream Argument in Meditation I. I argue that there is doubt about the existence of composite bodies not yet about the existence of a physical world. I also caution against using later parts of the Meditations to interpret the First Meditation on account of the order of reasons in this work. I connect the Omnipotent God argument to Descartes's views about innate ideas and analyze the First Meditation in relation to Descartes's anti-aristotelian purposes.