It is believed that Shinran, with the aim of propagating and handing down the original doctrine, chose direct disciples who would correctly inherit his teachings, against the background that an increasing number of people gradually run counter to the Shinran's teachings and propagated wrong doctrine.
時代が下り、親鸞の教えに背き誤った教義を広める者が増えたため、本来の教義を広め伝えるために、正しい教えを受け継ぐ直弟子を選出したものといわれている。