ONE SHOULD NOT REPEAT
TRANSLATION: This incident has been described in detail by Vrndavana dasa Thakura. Therefore I have described it only in brief.
PURPORT: This is a matter of etiquette. If a previous acarya has already written about something, there is no need to repeat it for personal sense gratification or to outdo the previous acarya. Unless there is some definite improvement, one should not repeat.
(C.C. Madhya 12.150)
Note: So why has Narayan Maharaja written another Bhagavad gita when Srila Prabhupada has already written it ?
The definite improvement is PRINT SRILA PRABHUPADA'S ORIGINAL BHAGAVAD GITA AS IT IS !!!