Devadatta, who committed the Three Rebellious Sins, as well as Rāhula, who observed the 250 precepts, similarly attained Buddhahood through the Lotus Sūtra. King Wonderful Adornment, who was attached to Brahmanism, as well as Śāriputra, a man who held the right view, were guaranteed future Buddhahood. This is what is meant by “If there are those who hear the Dharma, not even one will fail to attain Buddhahood.”

Sennichi-ama Gohenji, A Reply to Sennichi-ama, Writings of Nichiren Shōnin, Volume 7, Followers II, Pages 160