I have made a vow. Even if someone says that he would make me the ruler of Japan on the condition that I give up the Lotus Sūtra and rely upon the Kammuryō-ju-kyō (Sūtra of Meditation on the Buddha of Infinite Life) for my salvation in the next life, or even if someone threatens me saying that he will execute my parents if I do not say “Namu Amida-butsu,” and no matter how many great difficulties fall upon me, I will not submit to them until a man of wisdom defeats me by reason. Other difficulties are like dust in the wind. I will never break my vow to become the pillar of Japan, to become the eyes of Japan, and become a great vessel for Japan.

Kaimoku-shō, Open Your Eyes to the Lotus Teaching, Writings of Nichiren Shōnin, Doctrine 2, Page 105-106