Nichiren on performing the peaceful practices among disciples and believers

"Bodisattva Fukyo in the past, saying that all beings have the Buddha Nature and if they keep the Lotus Sutra, they will certainly attain Buddhahood and to slight them is tantamount to slighting Buddhas. Thus, he established the Practice of Bowing in Reverence; saying that, even those who do not keep the Lotus Sutra, if they were to keep it, have the Buddha Nature and would become Buddhas. He thus performed Bowing in Reverence in this way to those who did not keep it. How much more to the householders and priests who keep the Lotus Sutra. In the fourth fascicle of this Sutra it is taught that if one demeans, with even one evil word, those who keep and preach the Lotus Sutra, be it a householder or one who has left the household, the magnitude of the sin is beyond the sin of directly disparaging the Buddha Shakya. It is also preached, 'Whether true or untrue, those who keep the Lotus Sutra should not, even forgetfully, disparage each other, should they? The reason is that all those who keep the Lotus Sutra are necessarily Buddhas and to disparage a Buddha is to earn oneself a sin. When one understands it in this way, the merit of the Title (Daimoku) which one chants must be equal to the merit of Lord Shakya." -- Matsuno dono gohenji (Reply to Lord Matsuno)