Did Anselm, in his "Ontological Argument" (first advanced around 1070), make one of the greatest intellectual discoveries of all time, or did he merely fall into an interesting blunder?
In his day, Anselm was criticized by Gaunilo. Subsequent philosophers have generally considered Gaunilo's criticisms to be weighty. Descartes' attempt to resuscitate Anselm's argument led to Kant's supposed refutation, which most later philosophers have considered to be fundamentally sound. Charles Hartshorne has brought back the "Ontological Argument" as a major problem of modern philosophical analysis, and Anselm's Discovery has been described as his most systematic exposition of the history of the subject. According to Hartshorne, generations of philosophers have read Anselm superficially, and have failed to see that Anselm presented two forms of the Argument, the second involving a genuine conceptual breakthrough.
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