Valmiki Ramayana 7.36.48
सर्वासु विद्यासु तपोविधाने प्रस्पर्धते ऽयो हि गुरुं सुराणाम् ।सो ऽयं नवव्याकरणार्थवेत्ता ब्रह्मा भविष्यत्यपि ते प्रसादात्॥
sarvāsu vidyāsu tapovidhāne praspardhate 'yo hi guruṃ surāṇām |so 'yaṃ navavyākaraṇārthavettā brahmā bhaviṣyatyapi te prasādāt ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book