Spirit failing to keep to its abode

Mental derangement. The Magic Pivot (灵枢 líng shū, zhì zhēn yào dà lùn) states The heart... is the abode of essence-spirit. The spirit failing to keep to its abode reflects the conception that under normal circumstances the spirit resides in the heart, and that when it is made to leave the heart (by disease evil invading the heart or by mental stimulus), normal clarity of mind and composure is lost.