Preaching the sin of abusing upholders of the Lotus Sūtra, “The Teacher of the Dharma” chapter of the Lotus Sūtra states, “Suppose a person with evil intent keeps speaking ill of the Buddha in His presence for as long as a kalpa (aeons), his sin is rather light. Suppose a person utters a word to curse lay persons or monks who read and recite the Lotus Sūtra, his sin is extremely grave.”
The sin of cursing just one upholder of the Lotus Sūtra is as serious as this. How much more serious the sin of writing books, causing people all over Japan to curse the upholders of the Lotus Sūtra! How much more serious the sin of discouraging practicers of the Lotus Sūtra by designating this sūtra the teaching through which not even one out of 1,000 persons would be able to attain Buddhahood!
Shugo Kokka-ron, Treatise on Protecting the Nation, Writings of Nichiren Shōnin, Doctrine 1, Page 30