At this early stage, Nichiren’s claims for the daimoku were still rather modest. He presents it as an alternative for “ignorant persons” unable to perform the introspective contemplation on the “three thousand realms in a single thought-moment,” which those “who have the resolve” are encouraged to pursue. As for the merits resulting from this practice, Nichiren says only that those who chant it, even without understanding its meaning, will not be pulled down by worldly evils into the lower realms of transmigration but will eventually reach the stage of nonretrogression. Not until much later in life would he declare that “all persons, whether they have wisdom or not, should alike abandon other practices and chant Namu-Myōhō-Renge-Kyō” and advocate the daimoku as the sole practice for the direct realization of Buddhahood in this very body. (Page 248)
Original Enlightenment and the Transformation of Medieval Japanese Buddhism