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One may live for a very long time without complaining of bodily aches or pains, but it is unlikely that one will pass a day without experiencing something that causes anger, anxiety, sadness or gloom. This is due to the intrinsic essential nature of the soul and its volatile essence and changeability.
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Malik Badri (Abu Zayd al-Balkhi’s Sustenance of the Soul: The Cognitive Behavior Therapy of a Ninth Century Physician)