“The originally enlightened buddha of the perfect teaching abides in this world,” Nichiren wrote. “If one abandons this land, to what other land should one aspire? Wherever the practitioner of the Lotus Sūtra dwells should be considered the pure land.” Based on such thinking, Nichiren opposed the idea, extremely common in his time, of shunning this world as wicked and impure and aspiring to birth in the pure land of a buddha or bodhisattva after death. Because the various sūtras preached before the Lotus do not teach the perfect interpenetration of the buddha realm and the nine deluded realms, Nichiren asserted, the superior realms of buddhas and bodhisattvas that they mention, such as Amitābha’s Sukhāvati realm or Maitreya’s Tusita heaven, are merely provisional names; the “Lifespan” chapter of the Lotus reveals that the true pure land is to be realized here in the present, Sahā world.

By devotion to the Lotus Sūtra and to its daimoku practice, Nichiren taught, one manifests the reality of ichinen sanzen — or more simply stated, the Buddha’s enlightened state — within oneself, opening a ground of experience that is joyful and meaningful, independent of whether one’s immediate circumstances are favorable or not. Nichiren called this the “joy of the dharma.” In the Lotus Sūtra’s language, even in a world “ravaged by fire and torn with anxiety and distress” one can, so to speak, experience the gardens, palaces, and heavenly music of the buddha realm.

Another important implication that [the Life Span] chapter held for Nichiren was indeed this very possibility of realizing the buddha land in the present world. In the “Parable” chapter of the Lotus Sūtra, Śākyamuni describes the world as a “burning house” in which there is no safe place. But now in the “Lifespan” chapter, having revealed his true identity as the primordially awakened buddha, Śākyamuni declares that, even in the fire that destroys the world at the end of the cosmic cycle, his land — the present world — is “tranquil” and “never decays”; it is a place where sentient beings are “joyful.” This is the realm depicted on Nichiren’s mandala. Alluding to this sūtra passage, Nichiren writes, “Now the Sahā world of original time is the constantly abiding pure land, liberated from the three disasters and beyond the [cycle of the] four kalpas [eons]. Its buddha has not already entered nirvana in the past, nor is he yet to be born in the future. And his disciples are of the same essence. This [reality] … is the three thousand realms of one’s own mind.”

Medieval Japanese Tendai thinkers of various teaching lineages shared a loose consensus that the enlightenment of the primordial Śākyamuni Buddha was “hidden in the depths” of the “Lifespan” chapter and could be accessed through the practitioner’s “mind contemplation” or “mind discernment” (J. kanjin). Kanjin in the Tiantai/Tendai tradition was originally a broad term for practice, in contrast to doctrinal study. Though interpretations varied, by Nichiren’s time, kanjin had come to mean the essence of the Tendai Lotus teachings and was often associated specifically with the “Lifespan” chapter. For Nichiren, now in the mappō era, the “mind discernment” that opens the primordial buddha’s awakening to all people is the chanting of Namu Myōhō-renge-kyō. He took the daimoku to be the “good medicine” that the excellent doctor leaves for his children in the “Lifespan” chapter’s narrative. In his reading, this chapter’s revelation of the primordial buddha’s constant presence in this world immediately collapses all temporal and spatial separation between the Buddha and the devotee. “Two thousand years and more have passed since the Buddha entered nirvāṇa,” he wrote. “But for those who embrace the Lotus Sūtra, at each day, each hour, each moment, the Buddha’s voice reaches them, conveying to them the message, ‘I do not die.’ ” Through chanting the daimoku, the timeless realm of the Buddha’s original enlightenment is retrieved in the present moment; ordinary people manifest buddhahood just as they are, and their world becomes the buddha land.

“In terms of realizing buddhahood with this very body,” Nichiren wrote, “the trace teaching is the gate that affords entry, while the origin teaching holds its true meaning, that is, its actualization.” Where the trace teaching presents buddhahood as a potential inherent in the nine realms of unenlightened beings, the origin teaching shows the buddha realm revealed through the Buddha’s conduct in the nine realms, represented in particular by the bodhisattva realm. The buddha realm has no separate existence or mode of expression apart from the nine realms. Rather, the nine realms, without losing their individual character, are purified, elevated, and positively redirected in the light of the realized buddha realm. This is the awakened reality of the Buddha, which Nichiren termed “the single thought-moment comprising three thousand realms in actuality” (ji no ichinen sanzen). For him, this revelation had one sole scriptural locus: it was “hidden in the depths” of the “Lifespan” chapter of the origin teaching of the Lotus Sūtra.