During the first 500 years in the millennium of the Age of the True Dharma, men of śrāvaka all passed away, while in the last 500 years nearly all those bodhisattvas who had come from other worlds went back to their own lands. In the 1,000 years of the Age of the Semblance Dharma, Avalokiteśvara was reincarnated as Nan-yüeh; Medicine King Bodhisattva as T’ien-t’ai or Dengyō; Mañjuśrī as Gyōki, and Maitreya as Great Teacher Fu Hsi to help all the people.

Now in the Latter Age of Degeneration, these bodhisattvas, too, have all retired to their original dwellings. Other heavenly gods and terrestrial deities who are supposed to protect this world have either left it for other places or refused to protect the evil country while remaining in this world. They are also powerless in this world because they have not been fed with the taste of the True Dharma. For instance, nobody except great bodhisattvas with the Dharma Body can enter the three evil realms to save suffering beings because nobody except them are able to bear the great suffering there.

On the other hand, those great bodhisattvas emerged from the great earth in the first place have been in the Sahā World for incalculable aeons; in the second place they have been disciples of Śākyamuni Buddha ever since He was awakened by aspiration for enlightenment in the eternal past; and thirdly they were the first to receive the seed of Buddhahood in this Sahā World. More than any other great bodhisattvas, they have thus had close relationships with this Sahā World from their past lives.

Soya Nyūdō-dono-gari Gosho, A Letter to Lay Priest Lord Soya, Writings of Nichiren Shōnin, Doctrine 3, Pages 160-161.