Scott Davison

What sorts of things are there in the world? Clearly enough, there are concrete, material things; but are there other things too, perhaps nonconcrete or non-material things? Some people believe that there are such things, which are often called abstract ; purported examples of such objects include numbers, properties, possible but non-actual states of affairs, propositions, and sets. Following a long-standing tradition, I shall describe persons who believe that there are abstract objects as ‘platonists’. In this paper, I shall not directly address the plausibility of platonism, as compared with its rivals; instead, I shall confine my attention to one way in which some people have tried to combine platonism and theism. More specifically, I shall concentrate upon the claim that abstract objects depend upon God ontologically ; I shall argue that platonistic theists should reject DEP in favour of the claim that abstract objects exist independently of God. In order to evaluate the relative merits of DEP versus IND, it will be helpful to examine in some detail a particular articulation of DEP. When it comes to recent work on DEP, we can do no better in this regard than to examine the recent work of Thomas V. Morris and Christopher H. Menzel. According Morris and Menzel, there is a sense in which God literally creates such abstracta through engaging in intellective activities.

In his recent book Natural Law and Practical Rationality, Mark Murphy develops a sophisticated version of a natural law account of practical rationality. I shall show that with only a few minor changes, Murphy's account can be developed into an environmental ethic that generates human obligations to non-human animals, plants, and perhaps even ecosystems and machines. (I shall not discuss here the plausibility of this extension of Murphy's account, relative to competing accounts in environmental ethics; that discussion will have to wait for another occasion.) I begin with a brief sketch of Murphy's account, and then proceed to show how it can be developed into an environmental ethic, with particular attention to several crucial places in the overall argument of his book and arguments developed in other published works.