十二門論宗致義記 1.6

1.6

Question: Since it was not spoken by the Buddha, how can this be so? Answer: It is due to two meanings: First, because it belongs to that category, it is therefore subsumed under it. Second, the preaching of Dharma by the Buddhas is of three kinds: first, spoken by the Buddha himself; second, spoken through the empowerment of others; third, spoken with advance sanction. This treatise falls under the category of advance sanction. Because in the Laṅkāvatāra Sūtra and the Māyā Sūtra the Buddha prophesied that Nāgārjuna would ignite the torch of the true Dharma, one knows that he gave an advance prophecy permitting him to speak; therefore, it is also included within āptāgama and subsumed under the Dharma Piṭaka.