ān (安)

means “tranquil, easy, or at peace;” specifically, ān (安) is a quality of wèiqì (衛氣) rather than yíngqì (); in the terminology of modern TCM, that would be of qì (氣) rather than blood, of physical movement rather than emotion. This distinction is seen clearly in Língshū 47.5.1, where the heart is ān (安), so it cannot be harmed by perverse qì — xiéqì (邪氣), but is easily injured by worry. However, the clarity of this distinction seems to have eroded to some degree during the history of Chinese medicine.

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