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The Immutability-vs.-Omniscience Argument

11/11/2011

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1. If God exists, then he is immutable.
2. If God exists, then he is omniscient.
3. An immutable being cannot know different things at different times.
4. To be omniscient, a being would need to know propositions about the past and future.
5. But what is past and what is future keep changing.
6. Thus, in order to know propositions about the past and future, a being would need to know different things at different times (from 5).
7. It follows that, to be omniscient, a being would need to know different things at different times (from 4 and 6).
8. Hence, it is impossible for an immutable being to be omniscient (from 3 and 7).
9. Therefore, it is impossible for God to exist (from 1, 2, and 8).

The usual place at which this argument is attacked is its premise 4. It is claimed that a timeless being can know everything there is to know without knowing propositions about the past and future. Consider the following two propositions as examples:

A. The origin of the planet earth is in the past.
B. The end (or destruction) of the planet earth is in the future.

The claim is that a timeless being need not know propositions A and B in order to know everything there is to know, because such a being could know the exact dates of both the origin and the end of the earth and that would suffice for complete knowledge. That is, A and B would be "covered," and so it would not be necessary for the omniscient being to know A and B in addition to those dates.

But, of course, this claim can be challenged. To know the dates of the origin and the end of the earth does not entail knowing propositions A and B. To know A and B requires being situated within time (somewhere between the origin and end of the earth), so they are not anything that a timeless being could know. However, they certainly are things that an omniscient being must know. Thus, the given objection to premise 4 of the argument above is a failure.

It should be noted that a somewhat different incompatible-properties argument could also be constructed using the divine attribute of transcendence instead of immutability. The argument would focus on the point that a transcendent being must be timeless and a timeless being cannot know propositions about the past and future. However, an omniscient being, as shown above, must know propositions about the past and future. Therefore, it is impossible for a transcendent being to be omniscient. The incompatibility would be between attributes (c) and (e) on our list. Such an argument could be called "the Transcendence-vs.-Omniscience Argument." The same issues would be raised in it as were raised, above, in connection with the Immutability-vs.-Omniscience Argument.

RESPONSE:

CAN GOD LEARN ANYTHING?
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