Ideas from 'Why Propositions cannot be concrete' by Alvin Plantinga [1993], by Theme Structure
[found in 'Essays in the Metaphysics of Modality' by Plantinga,Alvin [OUP 2003,0-19-510377-7]].
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18. Thought / E. Abstraction / 1. Abstract Thought
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The idea of abstract objects is not ontological; it comes from the epistemological idea of abstraction
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Theists may see abstract objects as really divine thoughts
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19. Language / D. Propositions / 3. Concrete Propositions
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If propositions are concrete they don't have to exist, and so they can't be necessary truths
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19. Language / D. Propositions / 4. Mental Propositions
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Propositions can't just be in brains, because 'there are no human beings' might be true
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