The document summarizes Ven. Kanadeva's encounter with heretics in the 3rd century. When heretics impounded the bell and drum at a Buddhist temple, Kanadeva used supernatural powers to ring the bell from the tower to drive them out. Through an exchange of questions with a heretic, Kanadeva was able to defeat him and have him take refuge in the Buddha. Mazu later praised Kanadeva's approach as the "Kanadeva school" that could subdue all heresies.