The Mahāyāna response … to the question as to when a teaching can be considered to have been taught by the Buddha is that it does not matter whether or not it was taught by the historical Buddha, but whether it conforms to the truth, to those teachings we know the historical Buddha did teach, to the renunciation of defilement, and to revealing the praiseworthy qualities of nirvāṇa, the unconditioned. Of course, this criteria comes down to the subjective judgment of those who are evaluating a given teaching, but this is certainly in line with the Buddha’s advice to the Kālāmas when he told them that they should not depend upon external authorities, traditions, or even their own speculations, but rather to depend upon what they come to know for themselves directly is wholesome and praiseworthy and to be put into practice. Mahāyānists may consider the Śākyamuni Buddha who speaks in the Mahāyāna sūtras as the personification of a wisdom tradition whose initial inspiration is found, but not limited to, the life and teachings of the historical Gautama Buddha.

In the case of Nichiren and those who follow him, there is certainly the conviction that the Lotus Sūtra is an inspired teaching, and furthermore that it expresses the ultimate intent of the Buddhist tradition as a whole — the buddhahood or perfect and complete awakening of all people without exception. To bring this point home, Nichiren adds to the three proclamations two additional proclamations from chapter twelve of the Lotus Sūtra: the prediction of buddhahood given to Devadatta and the transformation of the dragon king’s daughter into a buddha. Based on these two exhortations or additional proclamations, Nichiren asserts that the Lotus Sūtra guarantees that all men and women can attain buddhahood. This universal guarantee of buddhahood is where Nichiren, basing himself on the Lotus Sūtra, believes that all the teachings of all the other sūtras, Mahāyāna and pre-Mahāyāna, are leading. It is, therefore, up to us to accept this with trust and joy, put it into practice, and find out for outselves.