Ramayana
स तु मेधाविनौ दृष्ट्वा वेदेषु परिनिष्ठितौ । वेदोपबृंहणार्थाय तावग्राहयत प्रभुः ॥ १-४-६
On seeing that pair intellectuals who are proficient in Veda-s that self-reliant sage Valmiki made those two to memorize the epic, as the epic Ramayana is composed only to reinforce the import of Veda-s, as an ancillary. [1-4-6]
english translation