- God, if he exists, is a being than which no greater can be conceived.
- A being whose nonexistence cannot be conceived is greater than a being whose nonexistence can be conceived.
- God’s nonexistence can be conceived.
- It is possible to conceive of a being whose nonexistence cannot be conceived.
- Therefore, a being greater than God can be conceived.
- It is not possible to conceive of a being greater than a being than which no greater can be conceived.
- Therefore, God does not exist.
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