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It makes us something more than just physical creatures with appetites.
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Now, we often think of freedom as simply consisting in doing what we want
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or in the absence of obstacles to getting what we want,
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that's one way of thinking about freedom.
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But this isn't Kant's idea of freedom.
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Kant has a more stringent demanding notion of what it means to be free.
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And though it's stringent and demanding,
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if you think it through, it's actually pretty persuasive.
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Kant reasons as follows:
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when we, like animals, seek after pleasure
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or the satisfaction of our desires or the avoidance of pain,
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when we do that we aren't really acting freely.