Lord Buddha Śākyamuni, the Buddha of Many Treasures and Buddhas in manifestation from all the worlds in the universe determined that the Lotus Sūtra was entirely true compared to the sūtras preached before, at the same time, and after the Lotus Sūtra. After this Śākyamuni Buddha retired to Mt. Sacred Eagle while the Buddha of Many Treasures and replica Buddhas from all the worlds in the universe went back to their respective homelands. Who, other than Śākyamuni Buddha, the Buddha of Many Treasures and replica Buddhas, can reverse the decision of the Lotus Sūtra being supreme of all the scriptures of Buddhism?

Soya Nyūdō-dono-gari Gosho, A Letter to Lay Priest Lord Soya, Writings of Nichiren Shōnin, Doctrine 3, Pages 162.