The Mukhya Upaniṣads

Aitareya · Adhyāya 1 · Khaṇḍa 3 · The Search for Food, and the Discovery of Who Asks

Passage 3

तदेनत्सृष्टं पराङत्यजिघांसत्तद्वाचाऽजिघृक्षत्तन्नाशक्नोद्वाचा ग्रहीतुम् ।स यद्धैनद्वाचाऽग्रहैष्यदभिव्याहृत्य हैवान्नमत्रप्स्यत् ॥ ३ ॥

In plain words

He tried to seize it with speech; he was unable to grasp it with speech. Had he grasped it by speech, i.e. merely by uttering [its name], then merely by speech, i.e. merely by uttering [its name], one would have been satisfied by food.