The third chapter, “A Parable,” of the Lotus Sūtra points out the graveness of the sin of slandering the True Dharma: “He who does not put faith in this sūtra and slanders it will destroy the seed of Buddhahood of all the people in the world.

I, Nichiren, encountering a severe earthquake, a typhoon, and famine in the Shoka Era (1257-59), and wide-spread epidemics in the first year of the Shōgen Era (1259), predicted that these were omens foretelling the invasion of this country, Japan, by foreign troops. I may sound as though I am singing my own praises, but I dare say this because, should this land of Japan be destroyed, there is no doubt that Buddhism also will be destroyed.

High priests these days, however, are in one mind with slanderers of the True Dharma, or they do not even know the exquisite doctrine of their own schools. I suppose these high priests will probably receive an imperial decree or shogunal order to pray for repulsing foreign invaders, but I am afraid that it will only intensify the anger of the gods and Buddhas, resulting in the destruction of the land of Japan.

I, Nichiren, also know how to repulse the impending foreign invaders. Except for those at Mt. Hiei, I am the only one who knows this in Japan. It is because two sages will not appear at the same time, just as there never will be two suns or two moons. If this is a lie, I will receive the punishment of the ten female rākṣasa demons, guardians of the Lotus Sūtra, which I, Nichiren, uphold. It is solely for the sake of the country, the dharma, and the people; not for myself that I say this to you. I say this to you also because I was able to see you earlier. If you do not accept my words, you will regret it.

Ankoku-ron Gokanyurai, The Reason for Submitting the “Risshō Ankoku-ron,” Writings of Nichiren Shōnin, Doctrine 1, Page 150