The true teaching is what Śākyamuni Buddha has now preached in the Lotus Sūtra. In order to help all the people in the world believe in the daimoku (Namu Myōhō Renge Kyō) consisting of seven (Chinese) characters, the essence of the “Life Span of the Buddha” chapter in the Lotus Sūtra, the Buddha of Many Treasures and the Buddhas in manifestation from all over the universe verified this.
Shimoyama Goshōsoku, The Shimoyama Letter, Writings of Nichiren Shōnin