There was a shift in emphasis in treatment over several centuries. A section of the Neijing Suwen including Chapter 74 was added by Wang Bing [ Wáng Bīng] in his 765 edition. In which it says: "Ruler of disease it called Sovereign, aid to Sovereign it called Minister, comply with Minister it called Envoy (Assistant), not upper lower three classes (qualities) it called." The last part is interpreted as stating that these three rulers are not the three classes of Shénnóng mentioned previously. This chapter in particular outlines a more forceful approach. Later on Zhang Zihe [ Zhāng Zĭ-hé, aka Zhang Cong-zhen] (1156–1228) is credited with founding the 'Attacking School' which criticized the overuse of tonics.