Mahayana Mahayana Mahayana tradition
What sutras were transmitted in secret? What sutras could have been preserved in non-human worlds? What tradition says that sutras might have come from other Buddhas or Bodhisattvas?
According to Mahayana tradition, the Mahayana sutras were transmitted in secret, came from other Buddhas or Bodhisattvas, or were preserved in non-human worlds because human beings at the time could not understand them:
question: What sutras were transmitted in secret?, answer: Mahayana | question: What sutras could have been preserved in non-human worlds?, answer: Mahayana | question: What tradition says that sutras might have come from other Buddhas or Bodhisattvas?, answer: Mahayana tradition