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Essay On Ontological Argument

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Is there a convincing version of the ontological argument?
The term 'the ontological argument' refers to a broad family of arguments for the existence of God, all of which share the characteristic of arguing from conceptual or a priori grounds to God's existence. A general ontological argument will inevitably suggest, in some fashion, that when we consider fully the correct idea or concept of God, and what this concept entails, the actual existence of this God is seen to be undeniable. This style of argument for God's existence is traditionally considered to have begun with Anselm of Canterbury, and we should begin our consideration of the argument there, detailing briefly the development of the argument, before moving on to consider the increasingly sophisticated, if ultimately no more successful, ontological arguments of Descartes, and more recently of Plantinga. I intend to show, and thus conclude, that whilst the ontological argument has, over time, been refined and reworked and at times might have appeared troubling to the atheist, it remains even in its strongest forms both intuitively unconvincing and demonstrably false. We might consider that the argument put forward by Anselm was the earliest complete form of the ontological argument. Anselm began by proposing a definition of God as 'that than which nothing greater can be conceived', and that we all, even the 'fool' atheist, have such an idea of God in our minds. Anselm's argument from this point runs thus: (1) I can conceive of a being than which nothing greater can be conceived. (2) This being exists thus only in my mind. (3) But, an equivalent being that also exists in reality would be greater than the original being. (4) Thus I cannot coherently maintain that such a being exists only in my mind.

The argument suggests that it is incoherent to concede that one can conceive of such a being whilst not conceding that such a being must exist in reality, or else not be 'that than which nothing greater can be conceived'. Anselm is thus either positing that existence in reality is a perfection, which must thus be attributed to a being that is defined as such, or that it is possible to conceive of something which is greater than the equivalent something which exists only in the mind, suggesting that anything defined as 'that than which nothing greater can be conceived' is by definition not something that can exist only in the mind. The intuitive response to such an argument is typified by that of Aquinas, who suggests simply that, whilst we may give any meaning we like to the word 'God', this meaning simply cannot affect the actual existence of the thing to which the word 'God' refers. It is also arguable that there is a distinction to be made between the statements 'I can understand the constituent words of the phrase 'a being than which nothing greater can be conceived' and 'I can conceive of, as a mental object possessive of some existence, a being than which nothing greater can be conceived', but Anselm appears to equate from one to the other without recognising this. The most damaging criticism it is possible to level at Anselm's ontology, however, is one more general than this. If it were so that the fool conceives of 'a not-really existing being than which nothing

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Author: Andrew Chapman
Category: Philosophy of Religion
Word Count: 1000

God’s Greatness

The Abrahamic conception of God is that he’s awesome—all-powerful, all-knowing, all-good, creator of the universe, self-existent, and a host of other properties that make him not just very, very great, but the greatest that there is or could possibly be.

“This is all fine and good,” say non-theists, “but this is a description of a being whose existence we don’t affirm.” However, a famous and powerful argument for God’s existence known as the Ontological Argument purports to be able to show that God’s being the greatest possible being entails God’s existence. The mere definition of God proves his existence.

Anselm’s Ontological Argument

While there are different versions of the Ontological Argument, I will here focus on one of the earliest: that set forth by St. Anselm.1

As we’ve already noted, God is the being than which no greater can be conceived. This is Anselm’s somewhat unwieldy description of God, which I will abbreviate BNGC. By definition, BNGC is the greatest conceivable being. If you think you’re conceiving of God and you can possibly conceive of a greater being, then you weren’t initially conceiving of God. Simple enough.

Now, certainly you can conceive of God. To conceive of something is just to think about it clearly and distinctly; you’ve been doing that since the beginning of this essay. So we know, at least, that God can exist in conception, i.e., can be conceived. Even the atheist should admit this. What the atheist is denying, and what the agnostic is refusing to affirm or deny, is that God existsin reality. So we have an intuitive distinction between a thing that existsmerely in conception and a thing that exists in realityas well as in conception.

Now here’s the meat of the argument: Assume that the atheist is right, that God doesn’t exist in reality, but merely in conception. But then there would be another possible being, a God who exists not merely in conception but also in reality as well, who is greater than BNGC.2 That is, there would be a possible being who is greater than the being than which no greater can be conceived. But no being can be greater than the being than which no greater can be conceived—that’s a flat-out contradiction! So our original assumption, that God doesn’t exist in reality, but merely in conception, must be false, since any assumption that entails a contradiction must be false. Therefore, God must exist both in conception and in reality. Therefore: God exists.3

The Ontological Argument is remarkable in that it reasons from premises containing only definitions and logical laws to perhaps the grandest philosophical conclusion there is. We can know that God exists merely by reflecting on the concept of God.

Many people, however, have been uncomfortable with the purported fact that we can prove the Almighty’s existence so apparently simply. Numerous critics, theist and non- alike, have criticized different aspects Ontological Argument. Here, I will look at just two of the most influential criticisms: those provided by Gaunilo of Marmoutiers and Immanuel Kant.

Gaunilo’s Criticism

Gaunilo was a monk and a contemporary of Anselm’s. In his “Reply on Behalf of the Fool,”4 Gaunilo has us imagine another really awesome thing: the island than which no greater can be conceived—let’s call it ‘INGC.’ This island has all the amazing-making properties you can think of: pristine white-sand beaches for lounging, warm water for swimming, and not a tourist in sight. But certainly such an island’s existing only in conception would entail a contradiction, since then there would be a possible thing greater than the INGC, namely, the existing INGC. Therefore, the INGC exists. And, of course, since we have picked island arbitrarily, we can run the same argument for any object: a building, a mousetrap, a horse, whatever you please.5

What Gaunilo has shown, then, is that, using Anselm’s form of reasoning, we can prove the existence of all sorts of bizarre entities, entities that clearly don’t exist. Accordingly, concludes Gaunilo, there must be something fatally wrong with Anselm’s reasoning.6

Kant’s Criticism

Which do you prefer, coffee or existing coffee? Notice that this is different from the question of whether you prefer coffee or no coffee at all. No coffee isn’t coffee while both coffee and existing coffee are coffee just the same! If it seems like we’re verging on Lewis Carroll-style nonsense here, you’re right, and this is exactly Kant’s criticism of the Ontological Argument.

According to Kant in his Critique of Pure Reason, what’s gone wrong with Anselm’s argument lies in the distinction between a thing that existsmerely in conception and a thing that exists in realityas well as in conception. According to Anselm, there are two different sorts of things: those that exist merely in conception and those that exist in reality as well as in conception. But an existing thing and its non-existing counterpart aren’t two different sorts of thing—one merely exists and the other doesn’t. While it is certainly true that some things exist and others do not, existing does not make a thing a different kind of thing from its non-existing colleague.

The upshot of this, says Kant, is that existence is a very special type of property, one not suited for the type of argument Anselm is running. Since there is no difference between the group of objects falling into the class God and those falling into the class existing God, an existing God can be no better and no worse than a mere God. There’s simply no relevant difference in kind between a God who exists and a God who doesn’t.


Of course, Gaunilo and Kant have not had the last word in this debate. Powerful arguments have been mounted in response to Gaunilo’s and Kant’s criticisms of the Ontological Argument. Additionally, increasingly complex versions of the Ontological Argument have been developed and debated. One thing that’s certain is that the Ontological Argument, whether sound or unsound, is a fascinating and powerful attempt at a proof for the existence of God.


1Two other famous formulations of the argument are Descartes’s formulation from the conception of existence as a perfection and Alvin Plantinga’s so-called Modal Ontological Argument.

2Which is greater, a God who exists merely in conception or a God who exists in reality as well as in conception? Think of all the things a God who exists in reality as well as in conception can do that a God who exists merely in conception cannot do: He can create worlds. He can listen to prayers. He can be the ultimate source and ideal form of goodness. He can reward virtuousness and punish vice… Those all seem like great things, and a God who exists merely in conception can do none of them.

3You may remember this type of argument or proof from your geometry courses where it was called an indirect proof. Philosophers and logicians call this a reductio ad absurdum, or a reduction to absurdity. The strategy, as you have seen, is to assume the opposite of what you are trying to prove, show how that assumption entails either a contradiction or some other form of absurdity, and then to reject the original assumption.

4“The fool has said in his heart, ‘There is no God.’” (Psalm 14:1)

5It’s important to note that we’re not merely talking here about the greatest actually existing island, mousetrap, horse…, but the greatest possible island, mousetrap, horse… It is plausible that for any type of existing object, one of the ones that exists is the best one (in terms of whatever makes that sort of thing a good one of what it is). But it is another thing altogether to talk about the greatest possible or greatest conceivable such object.

6Notice that Gaunilo’s argument is also a reductio ad absurdum: Assume that Anselm’s reasoning is valid and an absurdity results. Therefore, Anselm’s reasoning must be flawed.


Anselm, St., Proslogion, in St. Anselm’s Proslogion, M. Charlesworth (ed.), Oxford: OUP, 1965.

Descartes, R., Discourse on Method and The Meditations, translated with an introduction by F. Sutcliffe, Harmondsworth: Penguin, 1968.

Gaunilo, “On Behalf of the Fool”, in St. Anselm’s Proslogion, M. Charlesworth (ed.), Oxford: OUP, 1965.

Kant, Immanuel. Critique of Pure Reason. Trans. Paul Guyer and Allen W. Wood. Cambridge: Cambridge UP, 1998.

Oppy, Graham. “Ontological Arguments.” Stanford Encyclopedia of Philosophy. Stanford University, 08 Feb. 1996. Web. 27 June 2014. <http://plato.stanford.edu/entries/ontological-arguments/>.

Plantinga, Alvin. The Nature of Necessity. Oxford: Clarendon, 1974.

About the Author

Andrew is a lecturer in philosophy at the University of Colorado, Boulder. He holds a PhD in philosophy from the University of Colorado, Boulder, an MA in philosophy from Northern Illinois University and a BA in philosophy and a BM in bassoon and sound recording technology from Ithaca College. He specializes in epistemology, metaethics, and the history of philosophy (especially Kant and the 20th Century Anglophone and Phenomenological traditions). When not philosophizing, Andrew is skiing, hiking, listening to great music, or playing the bassoon.
Website: http://andrewdchapman.org/

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