The purpose of the Tripiṭaka teaching is to emancipate people from the Six Realms of the triple world. As a result, because the teaching reveals no place but the triple world to attain emancipation, śrāvaka and pratyekabuddha are unaware of the existence of the Pure Land where bodhisattvas are born. They also do not know that they still possess other evil passions and attachments besides the delusions in view and thought. Śrāvakas and pratyekabuddhas believe they will eliminate the cause of being reborn in the triple world if they do away with the delusions in view and thought and that they will exist in a void where there is no body or mind, since they will have transformed the body to ashes and annihilated consciousness. Thus it is said that men of the two Vehicles cannot be saved by the Tripiṭaka teaching, and that they will never be able to become Buddhas without the teaching of the Lotus Sūtra.

Ichidai Shōgyō Tai-I, Outline of All the Holy Teachings of the Buddha, Writings of Nichiren Shōnin, Doctrine 3, Page 72