Anu means not whimsically; following the superior authorities. You cannot write anything which is not approved by the superior authorities. Therefore, we have to give examples, quotations from the sastra, that “What I am speaking, it is supported by the sastra.” Not that “I have inventive power. I have…, I can do, I can write anything I like.” That is nonsense. Anukathane. Anukathane means you must hear from the authority perfectly. Then try to write. Not that you write whimsically, whatever you like. That is not allowed. And that will not be accepted.

From Srila Prabhupada’s lecture on Srimad-Bhagavatam 2.1.7 — June 15, 1974, Paris