"Because the Lotus Sutra is difficult to believe, the Buddha assumes various forms, such as that of one’s child, parent, or wife, to enable one to take faith in it. However, you have no children and live alone as husband and wife. The sutra states, “The living beings in it [the threefold world] are all my children.” If this is so, then Shakyamuni Buddha, the lord of teachings, must be a compassionate father to both of you. I, Nichiren, must be your child [...] The meritorious deeds you have accumulated in previous existences are indeed precious."
From Gosho "Reply to the Lay Priest of Ko" (The Writings of Nichiren Daishonin, page 491)
From Gosho "Reply to the Lay Priest of Ko" (The Writings of Nichiren Daishonin, page 491)