Grand Master Dengyō stated in the Treatise Revealing the Precepts: “Do not follow the law unless established by the lord. Do not believe in the teaching unless it is of Śākyamuni Buddha, King of the Dharma.” He also stated:

“When great bodhisattvas as respected as Four Reliances write commentaries on the sūtras, they hold viewpoints either from the provisional sūtras or the true sūtras. Expounding the teaching for the Three Vehicles (of śrāvaka, pratyekabuddha and bodhisattvas), they distinguish among three (provisional) teachings (piṭaka teaching for śrāvaka and pratyekabuddha, common teaching for all and the distinct teaching for bodhisattvas) and one (true) teaching, (perfect teaching for bodhisattvas). Thus, Grand Master T’ien-t’ai set four steps in the pre-Lotus sūtras to meet the needs of the Three Vehicles and established the teaching of the One Buddha Vehicle by the true teaching of the Lotus Sūtra. There is also a distinction among the six ways of practice by bodhisattvas: charity, precepts, perseverance, endeavor, meditation and wisdom. The precepts themselves are separated into those of the Hinayāna and the perfect precepts of the Lotus Sūtra. As the precepts they observe are different from each other, their dignities are not the same. Therefore, the teaching Grand Master T’ien-t’ai maintained is firmly based on the thoughts of the great bodhisattvas and founded on the sūtras which the Buddha expounded. (It is never of his own conjecture.)”

The present-day Tendai School in Japan regards Grand Master Dengyō as its founder. Therefore, it would be betraying Grand Patriarchal Master Dengyō in Japan and Grand Master T’ien-t’ai in China for them to have a thought that the Great Concentration and Insight of Grand Master T’ien-t’ai is not based on the Lotus Sūtra. Since the teaching that Grand Masters T’ien-t’ai and Dengyō transmitted is based on the Lotus Sūtra, their distant disciples should follow it. However, in fact, since scholars of the present-day Tendai School betray its teaching, they should recognize that despite bearing the name of the Tendai School, the teaching they advocate is dependent on the prejudicial teaching of Bodhidharma and the false words of Tripiṭaka Master Śubhākarasimha. According to the interpretations of Grand Masters T’ien-t’ai and Dengyo, the secret teaching T’ien-t’ai found deep down in mind is nothing but the word of the Wonderful Dharma.

Risshō Kanjō, A Treatise on Establishing the Right Way of Meditation, Writings of Nichiren Shōnin, Doctrine 2, Page 230-231