Valmiki Ramayana 7.36.14
यदा तु शास्त्राण्यध्येतुं शक्तिरस्य भविष्यति ।तदास्य शास्त्रं दास्यामि येन वाग्ग्मी भविष्यति॥
yadā tu śāstrāṇyadhyetuṃ śaktirasya bhaviṣyati |tadāsya śāstraṃ dāsyāmi yena vāggmī bhaviṣyati ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book