Gaunilo put forward three challenges to the first form of the Ontological Argument.
The first was gossip - he argued that what you hear from gossip about a person may lead you to assume you know what they are like without having met them, but you can be completely wrong.
The second was defining into existence - he believes that Anselm moved from understanding the concept of God to arguing that he must therefore exist.
The third and most famous was his analogy of the island - he said that by Anselm's logic, if you were to imagine a 'perfect' island, it would have to exist as it would not be perfect if it didn't.
Anselm argued back against this, saying that you can't compare a contingent thing (the island) with a non-contingent being (God). He also argued that a being "that than which nothing greater can be conceived" is unique.
Platinga said that islands have no 'intrinsic maximum' (they can always get better), but this does not apply to Anselm's God.
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