The key books of their doctrines are "Hoyosho" (the book that tried to justify kakushi nenbutsu) and "Osodeshita no Gosho" (the book on secret religious ceremonies that is handed down from one ceremony performer to the next).
その教義を形作っている書物には、『法要章』（ほうようしょう）や、秘事を行うものに相伝される『御袖下の御書』がある。