In his eleventh century dialogue De Casu Diaboli, Anselm seeks to avoid the problem of evil for theodicy and explain the fall of Satan as attributable to Satan’s own self-creating wrongful will. It is something, as such, for which God as Satan’s divine Creator cannot be held causally or morally responsible. The distinctions on which Anselm relies presuppose an interesting metaphysics of nonbeing, and of the nonbeing of evil in particular as a privation of good, worthy of critical philosophical investigation (...) in its own right. Anselm’s concept of nonbeing does not resolve the philosophical problem of evil implied by Satan’s fall from grace, but is shown perhaps more unexpectedly to enable Anselm’s proof for the inconceivable nonexistence of God as the greatest conceivable intended object of thought to avoid Kant’s Critique of Pure Reason objection to the general category of ”ontological’ arguments. (shrink)

In this paper, we discuss formal reconstructions of Anselm’s ontological argument. We first present a number of requirements that any successful reconstruction should meet. We then offer a detailed preparatory study of the basic concepts involved in Anselm’s argument. Next, we present our own reconstructions—one in modal logic and one in classical logic—and compare them with each other and with existing reconstructions from the reviewed literature. Finally, we try to show why and how one can gain a better understanding of (...) Anselm’s argument by using modern formal logic. In particular, we try to explain why formal reconstructions of the argument, despite its apparent simplicity, tend to become quite involved. (shrink)