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Replying to post 4 by DanieltheDragon]
A common misconception is that Anselm would allow one to attribute existence to absolutely anything one cold think up. Not true. What Anselm did was to set up checklists of seemingly contrary adjectives, such as cause vs. effect, existence vs. non-existence, etc., and then go down the list, ascribing the side to God which represented a perfection. Since by definition God is the supreme being, the most perfect of all beings, all perfections in the checklist had to be checked off for God. Note: That procedure did not hold for lesser beings, s they do not have all the perfections. Now, since existence is greater than nonexistence, actuality greater than potentiality, and God must take the greater of any adjective, then God must exist. On the other hand, the perfect island or flying spaghetti monster cannot have all the perfections and therefore do not automatically require a checkmark before "existence" in the potential-actual contrast.
Kant tried to demolish Anselm by arguing that "existence" is not perfection. the ten golden coins in your imagination were said to be just as perfect as the real ones, except that they lacked existence. However, other thinkers, including myself, do not agree with Kant. We believe existence is a perfection. You can't eat the ten donuts you imagine.