[T]he reason why I, Nichiren, insist on the supremacy of the Lotus Sūtra is as follows: while preaching the Lotus Sūtra the Buddha twice exhorted the listeners to actively spread the teaching. In addition, the Buddha expounded the Nirvana Sūtra for the purpose of amplifying the Lotus teaching. It is preached in the Nirvana Sūtra, “Suppose a good priest who upholds the True Dharma sees a man destroying the Buddha’s Dharma and ignores him without rebuking him, chasing him away, or chastising him. You should know that such a priest is a loathsome enemy of Buddhism.” …

Therefore if I, Nichiren, am afraid of the people in the world and do not rectify the false teachings of these tripitaka masters and grand masters, I will end up in being a loathsome enemy of the Buddha. Moreover, Grand Master Chang-an warns the scholars in the Latter Age of Degeneration in his Annotations on the Nirvana Sūtra: “He who destroys and confuses Buddhism is an enemy of Buddhism. He who pretends to be friendly while having no compassion to someone is someone’s enemy. He who rectifies someone’s mistakes is someone’s true friend.”

Ōta-dono-gari Gosho, A Letter to Lord Ōta, Writings of Nichiren Shōnin, Doctrine 3, Pages 199.