Grand Master Dengyō, the primogenitor of exoteric and esoteric Buddhism in Japan has said in his Hokke Shūku (Outstanding Principles of the Lotus Sūtra): “The canons of other sects, too, preach some ultimate reality, which is the mother of Buddhahood. However, those scriptures have motherly love but no strictness of the father. Only the Tendai Lotus Sect, with both its strictness and love, is the parent of all sages, wise men, those who have much to learn and nothing to learn, as well as of those who aspire for enlightenment.”

Kaimoku-shō, Open Your Eyes to the Lotus Teaching, Writings of Nichiren Shōnin, Doctrine 2, Page 77