革面革心

Explanation: See "leather face wash heart." 　　Source: Ming Yang Shen, "free of Shigeo Kan Yi Xue Ququan hand-rolled the word" laugh your humble servant fear end to end, Weiwei nine variables leopard, leather surface Gexin people to serve the heart, benefit me selfless. " 　　Examples: Hard of lead compound, based College six hundred free schools, Miao Qin Chen Qin Chen Chu to the study, was seeking test, then have ~. ★ Qing Wei, "Sheng Wu mind" VII