In this paper, I shall present and defend an ontological argument for the existence of God. The argument has two premises: possibly, God exists, and necessary existence is a perfection. I then defend, at length, arguments for both of these premises. Finally, I shall address common objections to ontological arguments, such as the Kantian slogan, and Gaunilo-style parodies, and argue that they do not succeed. I conclude that there is at least one extant ontological argument that is plausibly sound.

Otte :165–177, 2009) and Pruss :400–415, 2012) have produced counterexamples to Plantinga’s famous free will defence against the logical version of the problem of evil. The target of this criticism is the possibility of universal transworld depravity, which is crucial to Plantinga’s defence. In this paper, we argue that there is a simpler and more plausible free will defence that does not require the possibility of universal transworld depravity or the truth of counterfactuals of creaturely freedom. We assume only that (...) libertarianism is possibly true and that God’s existence is consistent with the existence of free agents who never go wrong. We conclude the paper by explaining how our defence may be able to succeed without assuming, in a way that is consistent with compatibilism. (shrink)

Latest version of my SEP entry on ontological arguments, which first appeared in 1996. General discussion of ontological arguments. Includes a brief historical overview, a taxonomy of different kinds of ontological arguments, a brief survey of objections to the different kinds of ontological arguments identified in the taxonomy, and more extended discussions of Anselm's ontological argument (Proslogion 2), Godel's ontological argument, and Plantinga's ontological argument.