However, in Korean Ganhwa Seon, the "topic of meditative inquiry" (Hwadu) must be examined with desperate doubt to know an answer to the inquiry rather than interpreting it from purely intellectual or conceptual perspectives. In particular, Master Subul argues it is a dead practice if the doubt can not be a main driving source to lead the practitioners to gain awakening during the Hwadu practice. He also stresses that there is only one-lifetime Hwadu to find an answer, and there is no need to examine one after another. One is solved thoroughly, and the rest are instantly resolved. That is the essence of Ganhwa Seon.