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And I think that's what Plato means
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when he suggests the mind is essential--
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the soul is essentially alive.
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It's a necessary property, as we might put it,
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of the soul, that it's alive, that it's capable of thought.
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So I want to say, "Not an implausible claim."
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Let's give it to Socrates.
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But once we give it to Socrates,
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Plato thinks now he's pretty much done.
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After all, think about what it means to say that
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something's got an essential property.
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Fire's got the essential property of being hot.