This is a letter of thanks written by Nichiren Daishonin on the fourth day of the fifth month in 1280. The lay nun Myōshin had sent the Daishonin offerings from her home in Suruga Province for the benefit of her deceased husband. The Daishonin assures her that the word myō of the daimoku she chants will act as an emissary and carry news about her and her children to her late husband. Moreover, he explains, the character myō is not only the cluster of all benefits but also the wish-granting jewel. He encourages her to believe in the immeasurable benefits of the daimoku.

https://www.nichirenlibrary.org/en/wnd-2/Content/322