The claim that scientific explanation is deductive has been attacked on both systematic and historical grounds. This paper briefly defends the claim against the systematic attack. Essential to this defence is a distinction between perfect and imperfect explanation. This distinction is then used to illuminate the differences and similarities between Aristotelian (anthropomorphic) explanations of certain facts and those of classical mechanics. In particular, it is argued that when one attempts to fit classical mechanics into the Aristotelian framework the latter becomes (...) structurally incoherent. It is suggested that this, together with the fact that classical mechanics embodied the first piece of perfect knowledge, accounts, in part at least, for the historical fact of the rapid demise of the Aristotelian patterns as the new science developed. On the basis of this discussion, the inadequacies of the attack on the deductive model on historical grounds by Toulmin come to be seen. (shrink)

A lengthy argument for the existence of a being possessing most of the attributes ascribed to God in traditional philosophical theology is set forth by John Duns Scotus in the final two chapters of his Tractatus De Primo Principio.1 In 3.1-19, Scotus tries to establish the core of his proof, viz., that "an absolutely first effective is actually existent." It is an ingenious blend of elements that figure in standard versions of the cosmological and ontological arguments. However, while the reader (...) of De Primo is apt to be deeply intrigued by the suggestiveness and originality of Scotus' discussion, attempting to organize and interpret the various threads of argument is a challenging task. This no doubt partially explains the relative neglect of Scotus' argument in contemporary discussion of theistic proofs. In what follows, I offer a reading of the argument as well as my critical assessment of it. I will contend that Scotus is unable to achieve all that he wants, in that a critical aspect of his official version of the argument is centrally flawed. However, the text also seems to suggest a modified version of the proof which relies on intuitive support for a possibility claim. I maintain that this form of the proof is sound. Furthermore, owing to the comparative weakness of its underived premises, Scotus' proof can be seen to offer a novel and appealing alternative to the more widely advertised versions of the cosmological and ontological arguments. If I am right, then, Scotus' De Primo has an important contribution to make to the contemporary discussion of an issue of perennial philosophical concern. (shrink)

I develop a new argument to the effect that past causal chains cannot extend back infinitely, but must instead terminate in a first uncaused cause. It has the advantage of sidestepping a historically prominent objection to cosmological arguments of this general type, one leveled by Aquinas and various other Scholastics.

Examples involving infinite suspended chains or infinite trains are sometimes used to defend perceived weaknesses in traditional cosmological arguments. In this article, we distinguish two versions of the cosmological argument, suggest that such examples can only be relevant if it is one specific type of cosmological argument that is being considered, and then criticize the use of such examples in this particular type of cosmological argument. Our criticism revolves around a discussion of what it means to call a system closed, (...) and what it means to call an explanation complete. Our analysis makes no suppositions about the nature of the infinite, and is therefore independent of many of the issues around which contemporary discussions of the cosmological argument have tended to revolve. (shrink)

One classical version of cosmological argument, defended famously by Thomas Aquinas and Duns Scotus, deduces the existence of a First Cause from the existence of a particular sort of causal series: one that is ‘essentially ordered’. This argument has received renewed defence in recent work by Feser, Cohoe, and Kerr. I agree with these philosophers that the argument is sound. I believe, however, that the standard defence given of the ECA in these philosophers can be complemented by a formulation that (...) appeals to the powers theory of possibility. This approach to possibility has been defended in recent years by, for example, Pruss, Jacobs, and Vetter. In this article, I show how this modal theory allows us to defend the ECA in a way that is dialectically advantageous as well as clarifying. (shrink)

Several of Thomas Aquinas's proofs for the existence of God rely on the claim that causal series cannot proceed in infinitum. I argue that Aquinas has good reason to hold this claim given his conception of causation. Because he holds that effects are ontologically dependent on their causes, he holds that the relevant causal series are wholly derivative: the later members of such series serve as causes only insofar as they have been caused by and are effects of the earlier (...) members. Because the intermediate causes in such series possess causal powers only by deriving them from all the preceding causes, they need a first and non-derivative cause to serve as the source of their causal powers. (shrink)

Hume’s famous character Cleanthes claims that there is no difficulty in explaining the existence of causal chains with no first cause since in them each item is causally explained by its predecessor. Relying on logico-mathematical resources, we argue for two theses: (1) if the existence of Cleanthes’ chain can be explained at all, it must be explained by the fact that the causal law ruling it is in force, and (2) the fact that such a causal law is in force (...) cannot explain the occurrence of the events in the chain. In order to perform (1), we manage to express in mathematical terms the intuitive idea that indefinitely delayed explanation is ultimately no explanation. In order to achieve (2), we identify a logical relation we can prove to be as strong as the causal relation at issue in the Cleanthes passage, according to a precise notion of strength of relations. (shrink)

This dissertation examines Locke's and Leibniz' explanation of the origin and nature of the world. As Leibniz writes in his "De Rerum Originatione Radicali," which is used as a guide to the issues addressed, this project involves answering two questions: "Why is there a world at all?" and "Why is the world the way it is?" Both Leibniz and Locke answer the first question by way of a cosmological argument for the existence of God as the first cause of the (...) world. I explicate and criticize these arguments. I also examine the metaphysical and theological presuppositions of the arguments. Leibniz's and Locke's views on the structure and intelligibility of the world answer the second question. (shrink)

This dissertation examines Avicenna's theory of efficient causation in light of his approach to central problems in metaphysics, from the proof of the Necessary Existent to his emanative cosmology. Avicenna provides an internally coherent metaphysical account of efficient causation. A metaphysical account of the efficient cause explains the existence of the effect or essence in a way that is not explained by the causes of motion, as investigated in physics. That is, a full explanation of the cause of the existence (...) of an essence is not found in the four causes of natural change and motion. Avicenna aims to clarify what the explanatory division of labor is between the account of the natural philosopher and that of the metaphysician. In so doing, Avicenna develops a theory of causation that ties his innovative concepts of the contingent in itself and necessary in itself to the concept of efficient causation. A central distinction that Avicenna advances in relation to the efficient cause is that between the cause of the effect qua species and the cause of the effect qua individual. The distinction is relevant to understanding his view of the role of the causes of the essence, including the Active Intellect. Drawing on the above theory of efficient causation, the study reexamines Avicenna's famous proof for the Necessary Existent. The analysis shows that his metaphysical account of efficient causation is at the heart of his proof for a Necessary Existent. The "cause of persistence", in particular, is argued to have a more critical role than previously acknowledged, and is explicated in the context of his theory of efficient causation in metaphysics. (shrink)