Murdoch's ontological argument

Anselm's ontological argument is an argument for the existence of God. This paper presents Iris Murdoch's ontological argument for the existence of the Good. It discusses her interpretation of Anselm's argument, her own distinctive appropriation of it, as well as some of the merits of her version of the argument. In doing so, it also shows how the argument integrates some key Murdochian ideas: morality's wide scope, the basicness of vision to morality, moral realism, and Platonism.     

Alvin Plantinga on the ontological argument

By taking ‘existence in reality’ to be a great-making property and ‘God’ to be the greatest possible being, Plantinga skillfully presents Anselm’s ontological argument. However, since he proves God’s existence by virtue of a premise, “God (a maximally great being) is a possible being”, that is true only if God actually exists; his argument begs the question of the existence of God.