St Anselm presented his ontological argument in Proslogion books 2 and 3. He began with a quotation from Psalm 14:1 “the fool says in his heart there is no God”, reasoning that existence is part of the definition of God, so that anybody who denies God’s existence is asserting a contradiction and so a fool. Gaunilo, a contemporary of St Anselm, responded in his wittily titled “on behalf of the fool”, rejecting Anselm’s reasoning systematically and concluding that atheists are not necessarily fools. Although St Anselm and Gaunilo were operating within different worldviews and with difference concepts of what existence entails, on balance and because Gaunilo’s more modern worldview dominates today, Gaunilo successfully defeats St Anselm’s ontological argument.
Firstly, Gaunilo is successful in pointing out that the atheist can recognise the word “God” without necessarily holding the entire concept of God in intellectu. He wrote “this being is said to be in my understanding already, only because I understand what is said.” Whereas St Anselm asserts that the atheist, in recognising the word God understands that God is “that than which nothing greater can be conceived of” and – because existence is a perfection – necessarily exists in re while simultaneously denying God’s existence, Gaunilo suggests that people often recognise a word without fully understanding what it refers to, as may be the case with God. Gaunilo later elaborates, explaining that as Anselm admits that God is unlike any other thing, it must be impossible for any person to understand what “God” is, because our understanding of new objects is usually built out of like objects. This is persuasive, as Aquinas would later agree [Summa Theologica 1,2,1] because God’s nature is to be mysterious and ineffable, so resisting all attempts to define him, let alone analyse that definition to determine whether necessary existence is part of it. Gaunilo continues by writing “I have in my understanding all manner of unreal objects, having absolutely no existence in themselves” – examples of such could be Gruffalos or unicorns – and he suggests that it would be possible to hold an idea of God who doesn’t exist in intellectu. This also is persuasive because, as Kant later wrote, “Whatever, therefore, our concept of an object may contain, we must always step outside it, in order to attribute to it existence…” Existential statements must be synthetic and capable of verification through the senses; it is not possible to analyse something, even God, into existence. While it is clear that Gaunilo (and later Kant) assume existence to refer to existence in the phenomenal world of time and space rather than to a non-contradictory concept or “clear and distinct idea” as Anselm (and later Descartes) did, it is Gaunilo’s worldview which dominates today and this supports the success of Gaunilo’s argument in defeating Anselm’s ontological argument.
Secondly, Gaunilo is successful in pointing out that the idea of God in intellectu exists prior to the existence of God in re being realised. He used St Anselm’s (and St Augustine’s) example of a painter and painting to make this point, reasoning that the idea of the painting exists in the mind of the painter before paint is applied to canvas. He wrote “The picture, before it is made, is contained in the artificer’s art itself; and any such thing, existing in the art of an artificer, is nothing but a part of his understanding itself.” In the same way, for Gaunilo the idea of God exists in the mind primarily and before the reality of God is admitted. This suggests that the atheist could have the idea of God in their mind separately from the necessary reality of God, leaving the possibility that God could only be the idea of a necessarily existing being and not a necessarily existing being. This links to Aristotle’s concept of the formal cause; the sculptor may have the form of the sculpture in his mind, but until he acts as an efficient cause on the material cause of the stone, the sculpture can’t be said to be real. Similarly, the soul as the formal cause of the body can’t be understood to exist independently of a body, in the way that a wax seal can’t exist without wax. Of course, Plato would disagree, arguing that forms are more real than material objects which reflect them, because they are complete and unchanging. However, Anselm’s platonic worldview has been replaced by the more Aristotelian worldview of Gaunilo today. Few would accept that ideas are more real than material objects, so that most would agree with Kant when he wrote “If then, I try to conceive a being, as the highest reality (without any defect), the question still remains, whether it exists or not. For though in my concept there may be wanting nothing of the possible real content of a thing in general, something is wanting in its relation to my whole state of thinking, namely, that the knowledge of that object should be possible a posteriori also…” The painting is only an idea until paint meets canvas in the real world… and however perfect it may be in concept won’t change that fact. Therefore, Gaunilo is successful in defeating Anselm’s ontological argument, because he identifies Anselm’s failure to establish God’s existence a posteriori as well as a priori.
Of course, Anselm rejected Gaunilo’s criticisms one by one in his “Responsio” reasoning that Gaunilo must be a fool if he believed that somebody could recognise the word God without appreciating that it refers to a supremely perfect being which – logically – must have the property of necessary existence. A person saying that a triangle has four sides could only be an idiot; Anselm cannot accept that an atheist is anything other than a fool. Further, Anselm rejected Gaunilo’s (mis)use of his analogy of the painter and painting, pointing out that while the idea of any normal object may well exist separately from and prior to its reality, this cannot apply to God who exists necessarily. In God’s case and God’s case only, the idea and the reality must be simultaneous and identical. However, Gaunilo’s reduction of St Anselm’s ontological argument to absurdity through the perfect island remains more persuasive than St Anselm’s indignant ripostes in the Responsio. This is because Gaunilo appeals to common sense when he wrote that “If a man should try to prove to me by such reasoning that this island truly exists, and that its existence should no longer be doubted, either I should believe that he was jesting, or I know not which I ought to regard as the greater fool: myself, supposing that I should allow this proof; or him, if he should suppose that he had established with any certainty the existence of this island.” In the same way Kant is persuasive when he appeals to common sense, writing “a man might as well imagine that he could become richer in knowledge by mere ideas, as a merchant in capital, if, in order to improve his position, he were to add a few noughts to his cash account.” We all know that we can’t analyse or think anything into existence, whether holiday islands or money!
In conclusion, Gaunilo’s criticisms of St Anselm’s ontological argument successfully defeat this attempt to prove God’s existence from reason alone… that is, for those who share Gaunilo’s modern worldview. Of course, those with a Platonist worldview – like Anselm himself and Rene Descartes – would disagree. As Norman Malcolm wrote “in those complex systems of thought, those ‘language games’, God has the status of a necessary being. Who can doubt that?” and yet claiming that God exist surely refers to more than a rule of one language-game? As Gaunilo rightly pointed out, rooting our concept of what exists in mere ideas is more likely to be foolish than rooting existence in shared experience.