तृतीयः सर्गः (Bālakāṇḍa 3): Vālmīki’s Yogic Verification and the Epic Synopsis
स तु मेधाविनौ दृष्ट्वा वेदेषु परिनिष्ठितौ |
वेदोपबृंहणार्थाय तावग्राहयत प्रभुः ||
sa tu medhāvinau dṛṣṭvā vedeṣu pariniṣṭhitau |
vedopabṛṃhaṇārthāya tāvagrāhayata prabhuḥ ||
Observing those two intelligent ones, well-grounded in the Vedas, that capable master taught them this epic so as to reinforce and illuminate the meaning of the Vedas.
Valmiki chose them because he observed they were 'medhāvinau' (highly intelligent) and 'vedeṣu pariniṣṭhitau' (expertly grounded in the Vedas), ensuring they had the intellectual and spiritual foundation to hold the epic.
The verse explicitly states 'vedopabṛṃhaṇārthāya', meaning the Ramayana was taught to expand upon, reinforce, and illustrate the abstract truths of the Vedas through narrative.