Ayurveda is a system of healing which evolved on the Indian subcontinent some 3000-5000 years ago… Ayurveda has both a spiritual and a practical basis, the spiritual aspect engendering the practical. According to Ayurveda, humans consist of three bodies or aspects: the physical, the subtle and the causal. In modern Western language these could be referred to as body, mind and spirit. The Ayurvedic system of health care emphasizes that health is a harmonious functioning of all three parts of this trinity.
— Scott Gerson M.D., Ayurveda: The Ancient Indian Healing Art (pp ix)