Nichiren on those like SGI who associate on friendly terms with slanderers

"On the other hand, even if one does not commit a single evil deed throughout one’s entire lifetime, and observes the five precepts, the eight precepts, the ten precepts, the ten good precepts, the two hundred and fifty precepts, the five hundred precepts, or countless numbers of precepts; even if one learns all the other sutras by heart, makes offerings to all the other Buddhas and bodhisattvas, and accumulates immeasurable merit, if one but fails to put one’s faith in the Lotus Sutra; or if one has faith in it, but considers that it ranks on the same level as the other sutras and the teachings of the other Buddhas; or if one recognizes its superiority, but constantly engages in other religious disciplines, practicing the Lotus Sutra only from time to time; or if one associates on friendly terms with priests of the Nembutsu, who do not believe in the Lotus Sutra but slander it; or if one thinks that those who insist the Lotus Sutra does not suit the people’s capacity in the latter age are guilty of no fault, then all the merit of the countless good acts one has performed throughout one’s life will suddenly vanish. Moreover, the blessings resulting from one’s practice of the Lotus Sutra will for some time be obscured, and one will fall into the great citadel of the Avīchi hell as surely as rain falls from the sky or rocks tumble down from the peaks into the valleys."