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:
কোন ঐতিহ্য বলে যে সূত্রগুলি অন্য বুদ্ধ বা বোধিসত্ত্ব থেকে এসেছে?
Mahayana tradition