Nichiren calls upon all Nichiren Buddhists to adhere to a single doctrine

"I do not know whether the Great Teacher Dengyō’s inner enlightenment was inferior or equal to that of Nāgārjuna and T’ien-t’ai, but I am convinced that, in calling upon all Buddhist believers to adhere to a single doctrine, he showed himself to be superior to Nāgārjuna and Vasubandhu and to surpass even Nan-yüeh and T’ien-t’ai." -- The Selection of the Time