Vedic knowledge must be understood through disciplic succession

[Bhakti Vikasa Swami]

Brahma knew the perfect description of creation, as it was exactly apprised to
him by the Supreme Lord Hari. Brahma, on being questioned by Narada, told
Narada exactly what he had heard directly from the Lord. Narada again told
exactly the same thing to Vyasa, and Vyasa also told Sukadeva exactly what he
heard from Narada. And Sukadeva was going to repeat the same statements as he
had heard them from Vyasa. That is the way of Vedic understanding. The language
of the Vedas can be revealed only by the abovementioned disciplic succession,
and not otherwise.

There is no use in theories. Knowledge must be factual. There are many things
that are complicated, and one cannot understand them unless they are explained
by one who knows. The Vedic knowledge is also very difficult to know and must
be learned by the abovementioned system; otherwise it is not at all understood.
Sukadeva Gosvami, therefore, prayed for the mercy of the Lord so that he might
be able to repeat the very same message that was spoken directly by the Lord to
Brahma, or what was directly spoken by Brahma to Narada.
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From Srila Prabhupada's purport to Srimad-Bhagavatam 2.4.25