Chapter four of the Nei Jing, Su Wen, entitled, “金贵真言论” or “True Sayings form the Golden Cabinet,” provides the following philosophical descriptions that will give the basis to understanding disease.
“阴阳者， 天地之道也，万物之纲纪，变化之父母， 生杀之本始， 神明之府也，治病必求于本。”
“Yin and Yang are the way of heaven and earth, the primary discipline of the universe, the mother and father of change, the root of birth and death, the godʼs palace also. To cure disease one must seek out its root…”
Nei Jing Eastern Medicine 