Nichiren Daishonin teaches in “On Repaying Debts of Gratitude” (“Ho'on-sho”),
"Nichiren's compassion is vast" indicates the virtue of parent; "to open the blind eyes of all the people" indicates the virtue of teacher; "blocks the path to the hell of incessant suffering" indicates the virtue of sovereign. Nichiren Daishonin is the True Buddha, endowed with the three virtues of sovereign (shu 主), teacher (shi 師), and parent (shin 親), whose great pure law will illuminate the infinite darkness of the fifth five-hundred-year period of Mappo.Since Nichiren’s compassion is vast, Nam-Myoho-Renge-Kyo will prevail for ten thousand years and beyond into the future. It possesses the beneficial power to open the blind eyes of all the people in Japan, and it blocks the path to the hell of incessant suffering. Its benefits surpass those of the teachings of Dengyo and Tiantai, and are far superior to those of Nagarjuna and Mahakashyapa.
(Gosho, p. 1036)
The Daishonin revealed his inner enlightenment (naisho) of Myoho-Renge-Kyo, in the form of the object of worship of the essential teaching, the Dai-Gohonzon. When us common mortals, filled with greed, anger, and stupidity, chant Nam-Myoho-Renge-Kyo to the Gohonzon, we can fuse with the life of the Original Buddha, and manifest the great benefit of attaining enlightenment in our present form (sokushin jobutsu 即身成仏). The Daishonin thus states:
Enlightenment is the fusion of wisdom and reality.
(MW-1, p. 123)