[T]he Lotus Sutra can be divided into two sections: the first half (Shakumon) and the second half Honmon). Nichiren concluded that the fundamental idea of the Lotus Sutra is manifested more clearly in the latter half than the first half, Furthermore, the central idea of the second half is elaborated in Chapter Sixteen, “The Duration of the Life of the Buddha.” The account in Chapter Sixteen is actually a continuation of the latter half of the previous chapter, “Bodhisattvas from Underground,” and is continued through the first half of the next Chapter, “The Variety of Merits.”

The three parts are closely enough related to form one single chain of thought. In his Kanjin-honzon-sho, Nichiren argues that the quintessence of the teachings of the Primal Mystery lies in this chain of three parts, which he specifically calls the “one chapter and two halves.” In addition, he declares that in our present Age of Degeneration, the teaching of the “one chapter and two halves” should be propagated in the abbreviated form of five Chinese characters, the title MYO-HO-REN-GE-KYO, meaning “The Sutra of the Lotus Flower of the Wonderful Dharma.”