In its claims for the salvific powers of the Lotus Sūtra, the “Description of Merits” chapter says that the merit accruing to those who generate even a single thought of willing acceptance — that is, faith — in the Lotus Sūtra immeasurably surpasses that gained by men and women who cultivate the first five perfections of a bodhisattva for eighty myriads of kotis of nayutas of eons. The sixth perfection, wisdom, is not included. But Nichiren held that wisdom, too, is inherent in, and emerges from, faith in the Lotus Sūtra. Scholars of his day, he notes, all agree that those who would practice the Lotus Sūtra must devote themselves to the three disciplines of moral conduct, meditative concentration, and wisdom; lacking any of these, one cannot attain the way. Nichiren adds, “I too once thought the same.” But over time, he became convinced that this was not the case. Citing the “Description of Merits” chapter to support his argument, Nichiren asserts that the Buddha had restrained persons at the first, second, and third of the five stages of practice from focusing on the cultivation of moral conduct and meditative concentration and directed them solely to cultivate some degree of wisdom.” And because our wisdom is inadequate, he teaches us to substitute faith, making this single word ‘faith’ the basis. … Faith is the cause for wisdom and corresponds to the stage of verbal identity.”

Nichiren understood the revelation of Buddha’s inconceivable “lifespan” as the very heart of the sūtra. The sūtra text makes clear that, even after realizing buddhahood, Śākyamuni has remained in the world, and will continue to do so, for countless eons, “teaching the dharma and inspiring sentient beings.” For Nichiren, this signaled a seismic shift in the entire concept of buddhahood as a realm apart from the nine realms of ordinary experience. Conventional understanding holds that the cause of buddhahood and its effect, that is, practice and attainment, are separated in time. To become a buddha, one must carry out the practices of the bodhisattva for three immeasurable eons, a staggering length of time spanning countless lifetimes. The “trace teaching” or shakumon portion of the Lotus Sūtra, even while extending the promise of buddhahood to all beings, still preserves this perspective on realizing buddhahood as a linear process in which one moves from practice (nine realms) toward attainment (buddhahood). We see this in Śākyamuni Buddha’s predictions in the sūtra’s early chapters that his individual śrāvaka disciples such as Sāriputra, Mahākāśyapa, and others will become buddhas in the remote future, after many eons of bodhisattva practice. From this perspective, buddhahood remains a distant goal, abstracted from one’s present experience.

But with the origin teaching, Nichiren wrote, the cause and effect of the pre-Lotus Sūtra teachings and of the trace teaching are “demolished” and “original cause and original effect” are revealed: “The nine realms are inherent in the beginningless buddha realm, and the buddha realm inheres in the beginningless nine realms. This represents the true mutual inclusion of the ten realms … and three thousand realms in a single thoughtmoment.” That is, he saw the origin teaching as overturning linear views of practice and attainment, in which one first makes efforts and then realizes buddhahood as a later result, and revealing that cause (the nine realms) and effect (the buddha realm) are present simultaneously; buddhahood is manifested in the very act of practice.