 Of old , in the time of the Warring States , Yang Zhu and Mo Di were engaged in violent controversy . Mencius deplored this and devoted himself to teaching benevolence and righteousness . His exposition of benevolence and righteoussness won the day , and the teachings of Mo Di and Yang Zhu were extirpated . In Han times the myriad schools of thought all flourished together . Tung Chung @-@ shu deplored this and revived Confucianism . Therefore the Way of Confucius shone forth , and the myriad schools expired . This is the effect of what I have called " correcting the root cause in order to overcome the evil " . 
