To begin with, the Lotus Sūtra is essential to the 80,000 Buddhist teachings, the bone marrow of the 12 kinds of scriptures. Various Buddhas in the past, present, and future attain perfect enlightenment under the guidance of this sūtra while the Buddhas that manifest in all the worlds throughout the universe guide sentient beings with the One Vehicle teaching of the Lotus Sūtra as the primary object.

Kyōdai-shō, A Letter to the Ikegami Brothers, Writings of Nichiren Shōnin, Volume 6, Followers I, Page 72