This paper examines how two Chan monks Jue-lang Dao-sheng and Wu-ke Hong-zhi integrated the three doctrines (Confucianism, Daoism and Buddhism) by employing two sets of metaphors, fire/furnace, and earth/pottery-wheel, respectively. They asserted that through cultivation of the three doctrines, human beings can be forged to the refined state from a simple and rudimentary state.