IF you wish to free yourself from the sufferings of birth and death you have endured since time without beginning and to attain without fail unsurpassed enlightenment in this lifetime, you must perceive the mystic truth that is originally inherent in all living beings. This truth is Myoho-renge-kyo. Chanting Myoho-renge-kyo will therefore enable you to grasp the mystic truth innate in all life.
The Lotus Sutra is the king of sutras, true and correct in both word and principle. Its words are the ultimate reality, and this reality is the Mystic Law (my?h?). It is called the Mystic Law because it reveals the principle of the mutually inclusive relationship of a single moment of life and all phenomena. That is why this sutra is the wisdom of all Buddhas.
Life at each moment encompasses the body and mind and the self and environment of all sentient beings in the Ten Worlds as well as all insentient beings in the three thousand realms, including plants, sky, earth, and even the minutest particles of dust. Life at each moment permeates the entire realm of phenomena and is revealed in all phenomena. To be awakened to this principle is itself the mutually inclusive relationship of life at each moment and all phenomena. Nevertheless, even though you chant and believe in Myoho-renge-kyo, if you think the Law is outside yourself, you are embracing not the Mystic Law but an inferior teaching. “Inferior teaching” means those other than this [Lotus] sutra, which are all expedient and provisional. No expedient or provisional teaching leads directly to enlightenment, and without the direct path to enlightenment you cannot attain Buddhahood, even if you practice lifetime after lifetime for countless kalpas. Attaining Buddhahood in this lifetime is then impossible. Therefore, when you chant my?h? and recite renge,1 you must summon up deep faith that Myoho-renge-kyo is your life itself.
---> https://www.nichirenlibrary.org/en/wnd-1/Content/1
On Attaining Buddhahood in This Lifetime