SB 3.20.9
vidura uvaca
prajapati-patih srstva
praja-sarge prajapatin
kim arabhata me brahman
prabruhy avyakta-marga-vit
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Vidura said: Since you know of matters inconceivable to us, tell me, O holy sage, what did Brahma do to create living beings after evolving the Prajapatis, the progenitors of living beings?
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Significant here is the word avyakta-marga-vit, “one who knows that which is beyond our perception.” To know matters beyond one’s perception, one has to learn from a superior authority in the line of disciplic succession. Just to know who is our father is beyond our perception. For that, the mother is the authority. Similarly, we have to understand everything beyond our perception from the authority who actually knows. The first avyakta-marga-vit, or authority, is Brahma, and the next authority in disciplic succession is Narada. Maitreya Rsi belongs to that disciplic succession, so he also is avyakta-marga-vit. Anyone in the bona fide line of disciplic succession is avyakta-marga-vit, a personality who knows that which is beyond ordinary perception.