Abstract

In the last ten years or so, talk of “possible worlds” has become decidedly more fashionable from a logical point of view. And here fashion is well-justified: both from a logical and from a metaphysical point of view, the work of Saul Kripke on the concept of a possible world is as challenging as any contributions since the time of Leibniz himself. It is only fair, then, and indirectly flattering, to complain that Kripke is limiting himself as a major philosopher in ways which Leibniz saw to be essential to balanced philosophy. We confine ourselves in this paper to just two crucial dimensions of philosophical depth when it comes to the concept of possible worlds. On the one hand, Leibniz saw the concept as one which raises very usefully many traditional problems of ethics, including those of free will and theodicy. On the other hand, Leibniz saw that questions about possible worlds may call for a radical approach to sane ontology. Such an approach, “revisionary metaphysics,” systematically reinterprets rather than dogmatically regurgitates the convictions of Plain Men and Theoretical Physicists about—to take a favorite example of Kripke’s—this single table’s being made of many distinct molecules.