Twenty important doctrines are in this Lotus Sūtra. Such sects as Kusha, Jōjitsu, Ritsu, Hossō, and Sanron do not know even their names while two sects of Kegon and Shingon plagiarized them to build their own fundamental structure. The “3,000 in one thought” doctrine, is hidden between the lines of the sixteenth chapter on “The Life Span of the Buddha” in the essential (hommon) section of the Lotus Sūtra. Although Nāgārjuna and Vasubandhu were aware of it. It is only our Grand Master T’ien-t’ai who embraced it.

Kaimoku-shō, Open Your Eyes to the Lotus Teaching, Writings of Nichiren Shōnin, Doctrine 2, Page 34-35