In this reply to Nichinyo, Nichiren Daishonin expresses his gratitude for her offerings to the Gohonzon and explains the significance of the object of devotion. The exact identity of Nichinyo is unclear. She is thought to have been either the wife of Ikegami Munenaka, the older of the Ikegami brothers, or a daughter of the lay priest Matsuno Rokurō Saemon, an earnest believer in Suruga Province. Judging from two letters the Daishonin sent her, she seems to have been a woman of good education and considerable affluence. Moreover, as the recipient of a Gohonzon, or object of devotion, she was evidently a sincere believer. This letter contains a description of the Gohonzon that details the figures represented therein and their significance. The Daishonin also underscores the importance of faith in the Gohonzon.

In the first half of the letter, the Daishonin points out the rarity and importance of the Gohonzon. He cites the Lotus Sutra and other works to show that the Gohonzon is the embodiment of “the true aspect of all phenomena” and “the three thousand realms in a single moment of life.”

In the second half, describing the great benefit of faith in the Gohonzon, the Daishonin declares, “Never seek this Gohonzon outside yourself,” adding that the Gohonzon is also found only in faith. Sharing two examples from secular tradition, the Daishonin reminds Nichinyo that faith is by far the most important element in manifesting “the Gohonzon” in one’s life. He concludes by stressing that chanting Nam-myoho-renge-kyo with faith is the most complete form of Buddhist practice.

https://www.nichirenlibrary.org/en/wnd-1/Content/101