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 / D. Concepts / 6. Abstract Concepts / a. Abstract concepts
The idea of abstract objects is not ontological; it comes from the epistemological idea of abstraction
Theists may see abstract objects as really divine thoughts
19. Language / E. Propositions / 2. Nature of Propositions
Propositions can't just be in brains, because 'there are no human beings' might be true
If propositions are concrete they don't have to exist, and so they can't be necessary truths