I guess that the psyche is the biggest reason for that. If you feel bad, negative, your skin might not be as good supplied with blood as in a positive situation; so the biolumniscent might not be optimal. But I don't think that the Aura is the biolumniscence, because the aura is always said to be spiritual, etheric, and not the result of emitting light. ^^ We are no spiritual bulbs.
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"Der Tod dauert das ganze Leben und beginnt dann, wenn er aufhört."
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