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Is that consistent with the categorical imperative, that false promise?
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Kant says no.
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And the test, the way we can determine
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that the false promise is at odds with the categorical imperative
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is try to universalize it,
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universalize the maxim upon which you're about to act.
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If everybody made false promises when they needed money
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then nobody would believe those promises,
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there would be no such thing as a promise,
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and so there would be a contradiction.
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The maxim universalized would undermine itself.
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That's the test.