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The Faculties:  

  • Divine Spirit/Preserve Species/Preserve Individual
  • Brain/Liver/Heart
  • Intellect/Attraction to Pleasure/Avoidance of Pain
  • Cognition/Affect/Behavior
  • Nervous Energy/Natural Energy/Vital Energy

Avicenna in his Law of Natural Healing (Canon of Medicine), Lecture 5, describes the three faculties that are referred to in many different ways falls under general physiology. It also contains O. Cameron Gruner’s extensive endnotes.


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