A critic says: 'By the same reasoning I can prove that the most perfect island exists, since an island that existed would be more perfect than one that did not.' Which argument is under attack, and by whom was this objection first made?
- The critic's parody moves from the idea of a most perfect thing to its real existence, with no appeal to observation.
- The argument that reasons from a concept alone to existence is the ontological argument of Anselm.
- The 'perfect island' reply was made by the monk Gaunilo, Anselm's contemporary, to show that the form of reasoning proves too much.
Answer: The ontological argument; the objection is Gaunilo's 'perfect island'.