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then you can understand the breakthrough
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that was made in fifth century Greece.
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This was in contrast to the supernatural divine and demonic theories,
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and it's in contrast to them
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that we can see the importance of a new idea;
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the idea that disease instead is a naturalistic event
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that can be understood by natural causes.
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Examples of this new,
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naturalistic, secular view
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abounded in the fifth century.
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You can see it in Thucydides,
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in his account of the Peloponnesian War,