"Most asthenia syndromes [chronic diseases marked by deficiency of vital energy and lowering of resistance] are caused by a deficiency of yin in the blood or a lack of conditioning of the heart. If a physically strong patient is suffering from shizheng disorders [such as high fever, constipation, or stasis of the blood], it is because the 'fires' of the heart are too high."
「若為虛證多屬陰血不足，心失所養；若為實證則多為火盛擾心，因心火亢盛或肝鬱化火所致。」