The 16th chapter of the Lotus Sūtra on “The Life Span of the Buddha” states, “Various sūtras preached by the Buddha ever since His attainment of Buddhahood in the eternal past are nothing but the truth; none of them are provisional.” This is interpreted by Grand Master T’ien-t’ai in his Words and Phrases of the Lotus Sūtra, fascicle 9: “All those who overcame illusions of the triple world through provisional teachings inevitably attained enlightenment. From this we can see that provisional pre-Lotus sūtras were expounded for the purpose of leading the people to the True Dharma of the Lotus Sūtra.”

Grand Master Miao-lê explains it further in his Annotations on the Words and Phrases of the Lotus Sūtra, fascicle 9: “Overcoming illusions of the triple world through provisional teachings of pre-Lotus sūtras is provisional, not true, extinction. Therefore, it is termed ‘provisional extinction.’ Those who practiced three kinds of Buddhist practice (bodhisattvas, men of śrāvaka and pratyekabuddha) during the pre-Lotus periods all got rid of illusions of the triple world, and there exist no humans and heavenly beings who did not escape from the suffering of the three lowest realms (hell, realm of hungry spirits and that of beasts). Compared to the complete extinction of illusions of the triple world through the teaching of the Lotus Sūtra, however, theirs is merely a provisional extinction.”

Toki Nyūdō-dono Go-henji: Hongon Shukkai-shō, A response to Lay riest Lord Toki: Treatise on Overcoming Illusions of the Triple World by Provisional Teachins, Writings of Nichiren Shōnin, Doctrine 2, Page 276