The Buddha preaches in “The Appearance of Bodhisattvas from Underground” of the Lotus Sūtra that those who doubt and do not believe in this sūtra will fall into the evil realms of hell, hungry spirits, and beasts. This means that all who have the ability of understanding but do not have faith in the Three Treasures will fall into the evil realms. Nevertheless, scholars today wonder how those who only have belief in the Three Treasures but cannot understand what the sūtra means are able to avoid falling into the evil realms by just chanting Namu Myōhō Renge Kyō. These scholars are those who will go down to the most terrible hell, according to the sūtra cited above. Therefore, people can escape the evil realms without understanding the sūtra perfectly as long as they chant Namu Myōhō Renge Kyō.

Hokke Daimoku Shō, Treatise on the Daimoku of the Lotus Sūtra, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 37