[I]t is against the will of the Buddha to interpret the pre-Lotus sūtras according to the words of those sūtras. This is so because, as stated in the third fascicle of the Annotations on the Words and Phrases of the Lotus Sūtra, the whole truth is not revealed in the pre-Lotus sūtras. It is further said in the tenth fascicle of the Commentary on the Profound Meaning of the Lotus Sūtra that only the Lotus Sūtra reveals the true meaning of the pre-Lotus as well as the meaning of the Lotus Sūtra, the sole purpose of the Buddha appearing in this world.

Nijō Sabutsu Ji, Obtaining Buddhahood by the Two Vehicles, Writings of Nichiren Shōnin, Doctrine 3, Page 228