St. Anselm of Canterbury - This character is one of the most important philosophers of the medieval period, after St. Augustine and St. Thomas Aquinas. He produces many of the most important arguments in favor of natural theology, which is the branch of theology that attempts to establish religious truths through reason.
God - While this character does not speak in the book, Anselm refers to Him on nearly every page.
Gaunilo of Marmoutier - This character is a monk from Marmoutier who criticizes Anselm's ontological argument.
Jesus Christ - This character is the second person of the Trinity, who is both identical and not identical with God the Father and the Godhead.
The Holy Spirit - This character is the third person of the Trinity, who is both identical and not identical with God the Father and God the Son.
Boso - This character is Anselm's...
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