AITAREYA UPANISHAD · 1.3.3

तदेनत्सृष्टं पराङ्त्यजिघांसत् तद्वाचाजिघृक्षत् तन्नाशक्नोद्वाचा ग्रहीतुं स यद्धैनद् वाचाग्रहैष्यदभिव्याहृत्य हैवान्नमत्रप्स्यत् ॥ ३ ॥

tadenatsṛṣṭaṃ parāṅtyajighāṃsat tadvācājighṛkṣat tannāśaknodvācā grahītuṃ sa yaddhainad vācāgrahaiṣyadabhivyāhṛtya haivānnamatrapsyat ॥ 3 ॥

Food being created fled back from his grasp. By speech He would have seized it, but He could not seize it by speech. Had He seized it by speech, then would a man be satisfied by merely speaking food.