Stephen A. Makin

Modalities enter into practically every area of contemporary philosophy. Great progress has been made in understanding the variety of differences between what is possible, what is actual, and what is necessary. But things were not always so clear. We owe a great debt in this area, as in so many others, to Aristotle, who had a lot to say on the topic, part of which comprises his discussion and use of the actuality/potentiality distinction. One important task in understanding his discussion of actuality and potentiality is locating the distinction within the wider area of modality in general. One very general area in which modalities are significant is the assessment of arguments. Aristotle provides us with the basics of a modal logic, and in Metaphysics V 12, treats the family of modal notions expressed by the Greek noun dunamis and its cognates. This article explores his account of energeia and dunamis, matter and substance, capacities, natures, and dispositions.

[Stephen Makin] Aristotle draws two sets of distinctions in Metaphysics 9.2, first between non-rational and rational capacities, and second between one way and two way capacities. He then argues for three claims: [A] if a capacity is rational, then it is a two way capacity [B] if a capacity is non-rational, then it is a one way capacity [C] a two way capacity is not indifferently related to the opposed outcomes to which it can give rise I provide explanations of Aristotle's terminology, and of how [A]-[C] should be understood. I then offer a set of arguments which are intended to show that the Aristotelian claims are plausible. \\\ [Nicholas Denyer] In De Caelo 1: 11-12 Aristotle argued that whatever is and always will be true is necessarily true. His argument works, once we grant him the highly plausible principle that if something is true, then it can be false if and only if it can come to be false. For example, assume it true that the sun is and always will be hot. No proposition of this form can ever come to be false. Hence this proposition cannot be false. Hence it is necessarily true, and so too is anything that follows from it. In particular, it is necessarily true that the sun is hot. Moreover, if the sun not only is and always will be hot, but also always has been, then it follows by similar reasoning that the sun not only cannot now fail to be hot, but also never could have failed. Anything everlastingly true is therefore, in the strictest sense of the term, necessarily true

This paper engages with the idea at the core of my co‐symposiast's paper ‘Ethics of Substance’ : that the Aristotelian concept of substantial being has ethical implications, and an alternative understanding of existence in terms of affecting and being affected will help us more easily to accommodate relational values, which are thought to sit uneasily within the Aristotelian framework.I focus on two questions. First, is there really is a tension between an Aristotelian metaphysics of substance and concern for others? The answer depends on how we understand the relation between my valuing something indeterminate but determinable and my valuing the particular way in which that determinable is contingently determined. I agree that Carpenter is correct in identifying the tension she does.Second, does the alternative Buddhist influenced view of what it is to exist shift our attention from ethical values such as independence and autonomy onto interpersonal and relational values? I consider an example which reflects another aspect of Aristotle's outlook: his account of the ontological status of the simple material elements. I suggest that once we abandon the idea that such elements exist in virtue of specific intrinsic structures, then questions about their persistence through the changes by reference to which they are identified at the very least admit of no determinate answer. This suggestion also supports the line taken in Carpenter's paper.

In this lucid and insightful study, Stephen Makin investigates a form of argument widespread in ancient Greek philosophy, where the absence of a reason for one alternative to be the case rather than another is used to establish substantive conclusions—where the alternatives are “indifferent”. Examples abound: Anaximander engages in such reasoning to show that the Earth does not move; Zeno of Elea to show that what is cannot be divided; Democritus to argue for finite divisibility, on the one hand, and the infinite variety of atoms and worlds, on the other; not to mention the extensive use of such arguments in ancient skepticism.