As you and your elder brother were born in the Latter Age of Degeneration in an outlying country and have faith in the Lotus Sūtra, I was sure that demons would possess the nation’s ruler or your parents and persecute you. But as I expected, despite your father disowning you repeatedly, you two brothers held onto your faith. Are you the reincarnation of Princes Pure Store and Pure Eyes, who led their father King Wonderful Adornment? Or is this through the discretion of Bodhisattva Medicine King and Bodhisattva Superior Practice [sic]? Your father’s disinheritance was revoked in the end and you were able to carry through with filial piety as before. Are you not filial sons in the truest sense of the word? I am sure the various heavenly beings are pleased, and the ten female rākṣasa demons, protectors of the Lotus Sūtra, accept your aspiration. Moreover, there is something heartfelt about you. When my doctrine spreads as widely as predicted in the Lotus Sūtra, I hope to share the joy with you.

Kōshi Gosho, A Letter to Filial Sons, Writings of Nichiren Shōnin, Volume 6, Followers I, Page 103-104