[T]he king of devils in the Sixth Heaven is bound to interfere with the practicers of the Lotus Sūtra. This is explained as the delusion of devils among the ten objects of meditation listed by Grand Master T’ien-t’ai in his Great Concentration and Insight. Devils delight in obstructing the virtuous and helping spread evil. Unable to force virtuous people to do evil, however, devils cannot help but let them do meritorious deeds. Or, they will encourage those who practice the teachings for “Two Vehicles” (men of śrāvaka and pratyekabuddha), such as doctrines of the “four noble truths” and the “twelve links of cause and effect,” to switch to less meritorious practices like the “five precepts” and “ten good acts.” Bodhisattvas practicing the “six pāramitā ways leading to Buddhahood” may be encouraged to downgrade to Two Vehicle teachings. Finally, those who single-heartedly practice the purely perfect teachings of the Lotus Sūtra are induced to downgrade the practice to such as the “distinctive teaching.” This is explained in detail in the Great Concentration and Insight, fascicle 8, so you had better consult it.

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 278-279