What Nichiren declared at Seicho-ji in 1253 was, on its surface, a claim about which scripture mattered most: that the Lotus Sutra alone carried the Buddha's complete teaching for a degenerate age, and that every other Buddhist school's reliance on other texts or practices was therefore inadequate or worse. In the religiously plural Kamakura Japan of his day, that was not a private theological opinion but a direct challenge to the standing of every rival school and, by extension, to the political and religious authorities that patronized them. Nichiren pressed the challenge in writing and in person for the rest of his life, submitting formal remonstrances to the shogunate arguing that the country's troubles, natural disasters and the looming threat of Mongol invasion among them, followed from its devotion to false teachings. The cost was real and repeated: attacks by rival factions, two exiles, and a 1271 arrest that came within reported moments of execution before he was instead sent to Sado Island for over two years. He never recanted, and his late writings from Minobu show a teacher still elaborating the same claim rather than softening it, confident enough in it to spend his final years teaching students who would carry it forward as a distinct lineage rather than a faction within Tendai. The multiple schools that trace themselves to him today, sometimes sharply divided from each other on questions of practice and authority, all still open from that single 1253 declaration.