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You believe that there is no God? Well, what is God? Suppose that God is the greatest being that can be conceived. Now even if you don’t think that such a being exists, you can still understand the idea of such a being; you can still conceive of it. Therefore, whether or not such a being exists in reality, it must at least exist in your mind. But a being that existed in reality would be greater than a being that existed only in your mind. Therefore, for such a being to exist only in your mind, and not in reality, would be a contradiction in terms; for if it existed only in your mind, it would both be the greatest being that can be conceived (that’s what you’re conceiving of) and not be the greatest thing that can be conceived (because the same being existing in reality would be greater). So the greatest being that can be conceived – this being must exist in reality as well as in thought.
This is a simplified version of Anselm’s argument for the existence of God, often called the “ontological” argument. I’m not sure whether it really works; I’m inclined to say it doesn’t, although it’s hard to say where the logic goes wrong, especially in the more sophisticated version presented by Anselm himself.
Nevertheless, I consider it the best and most important of the proofs of God’s existence, even if it doesn’t work. Why? Continue reading