What is thread 1?
Anselm’s ontological argument + Descartes
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Gaunilo’s perfect island (Anselm specific)
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Kant’s objection based on existence not being a predicate
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Discovering something exists changes our conecpt
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Discovering something exist changes our beliefs, not our concepts
What is Thread 2?
Malcolm’s ontological argument
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Empiricist objection to a priori arguments for existence
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Hume’s fork is wrong
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These are not genuine exceptions
What is Anslem’s ontological argument
Deductive and A priori
What is Descartes’ Ontological argument
Deductive and A priori
What is Gaunilo’s perfect island?
Anselm specific
Gaunilo replies with a parallel example:
- Imagine the greatest possible island, everything about it is perfect
- Using Anselm’s logic, the concept of the perfect island, would be greater if it also existed in reality
- So it must exist in reality
- But this is absurd
Kant’s: Existence is not a predicate
Anselm says existence is greater than non existance, and Descartes says that existence is perfection:
- However, in both of these cases existence is not adding (and will never add) anything to the concept of god, it isn’t a predicate!
- 100 Thaylers example
- When we think of God, we are already assuming existence in our conception, but ony in our idea. Our idea of God having the attribute of existing doesn’t mean it does exist anymore than the thaylers would.
Discovering something exists changes our conecpt
Discovering something exist changes our beliefs, not our concepts
What is Malcolm’s ontological argument
What is Hume’s fork?
All knowledge is divided into -
Relations of ideas:
- A priori
- True by definition
- Analytic
And Matters of Fact:
- A posteriori
- Empirically verified
- Contingent
Empiricist objections to a priori arguments for existence
Malcolm’s ontological argument cannot prove that God exists a priori. This is because:
- All existence claims are matters of fact
- They are only known through experience
- A prioi reasoning only establishes relations of ideas,
Hume’s fork is wrong
An exception to Hume’s fork for example is that we can claim that abstract numbers like 7 exist despite the fact that we have never had experience of them.
We know of their existence a priori, and God is the same.
These are not genuine exceptions
Abstract numbers do exist and we do have experience of them, we experience them through things that represent their