[There] once was an ordinary man who strictly observed the precept against telling lies. Although his eyes were gouged out, his skin stripped, his flesh cut off, his blood sucked up, his bones broken, his children killed, and his wife attacked, he refused to lie even once for innumerable kalpa (aeons), and thereby attained Buddhahood. As the Buddha, he then preached the Expedients chapter in the Lotus Sūtra: “There is none who will not become a Buddha.” Namely, he has preached that anyone who said “Namu Myōhō Renge Kyō” even once will not fail to become a Buddha. Even if Śākyamuni Buddha alone said this, there should be absolutely no doubt about its veracity. How could the Buddha utter a false statement before the assembly of various Buddhas from all the worlds in the universe? Besides, Śākyamuni Buddha as well as all the Buddhas from the worlds throughout the universe at the same time extended their long tongues to the Mahābrahman Heaven to prove its truthfulness.

Nanjō-dono Gohenji, Reply to Lord Nanjō, Writings of Nichiren Shōnin, Followers II, Volume 7, Page 41-42