The Mukhya Upaniṣads

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

Passage 9

तच्छिश्नेनाजिघृक्षत्तन्नाशक्नोच्छिश्नेन ग्रहीतुं स यद्धैनच्छिश्नेनाग्रहैष्यद्विसृज्य हैवान्नमत्रप्स्यत् ॥९॥

In plain words

He tried to seize it with the generative organ; he was unable to grasp it with the generative organ. Had he grasped it with the generative organ, i.e. merely by emitting, then merely by with the generative organ, i.e. merely by emitting, one would have been satisfied by food.