|Canto 7: The Science of God||Chapter 15: Instructions for Civilized Human Beings|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 7.15.69
ahaḿ purābhavaḿ kaścid
aham — I myself; purā — formerly; abhavam — existed as; kaścit gandharvaḥ — one of the denizens of Gandharvaloka; upabarhaṇaḥ — Upabarhaṇa; nāmnā — by the name; atīte — long, long ago; mahā-kalpe — in a life of Brahmā, which is known as a mahā-kalpa; gandharvāṇām — among the Gandharvas; su-sammataḥ — a very respectable person.
Long, long ago, in another mahā-kalpa [millennium of Brahmā], I existed as the Gandharva known as Upabarhaṇa. I was very respected by the other Gandharvas.
Śrīla Nārada Muni is giving a practical example from his past life. Formerly, during the previous lifetime of Lord Brahmā, Nārada Muni was one of the denizens of Gandharvaloka, but unfortunately, as will be explained, he fell from his exalted position in Gandharvaloka, where the inhabitants are extremely beautiful and expert in singing, to become a śūdra. Nonetheless, because of his association with devotees, he became more fortunate than he was in Gandharvaloka. Even though cursed by the prajāpatis to become a śūdra, in his next life he became the son of Lord Brahmā.
The word mahā-kalpe is described by Śrīla Madhvācārya as atīta-brahma-kalpe. Brahmā dies at the end of a life of many millions of years. The day of Brahmā is described in Bhagavad-gītā (8.17):
ahar yad brahmaṇo viduḥ
te 'ho-rātra-vido janāḥ
"By human calculation, a thousand ages taken together is the duration of Brahmā's one day. And such also is the duration of his night." Bhagavān Śrī Kṛṣṇa can remember incidents from millions of years ago. Similarly, His pure devotee like Nārada Muni can also remember incidents from a past life millions and millions of years ago.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness