The document summarizes Anselm's ontological argument for the existence of God and various criticisms of the argument. Anselm's argument is that God, defined as "that than which nothing greater can be conceived", must exist in reality to be greater than a being that exists only in the mind. Critics argue that existence is not a predicate that can be added to concepts, one cannot conceive of infinite attributes, and the argument assumes God's possibility and thus existence from the start, begging the question.