The Prashna Upanishad with Shankara’s Commentary
अन्नं वै प्रजापतिस्ततो ह वै तद्रेतस्तस्मादिमाः प्रजाः प्रजायन्त इति ॥ १४ ॥
annaṃ vai prajāpatistato ha vai tadretastasmādimāḥ prajāḥ prajāyanta iti || 14 ||
14. Food indeed, is the lord of creation; from that, indeed is the semen virile; from that are all these creatures produced.
Com.—Thus modified in this order, food is the lord of creation. How? From that is semen virile, the seed in man, the cause of creation. From that, sprinkled in woman, these creatures, such as men, etc., are produced. What was asked for, from whence are creatures produced, has thus been determined, that these creatures are produced by couples, beginning with the sun and the moon and ending with the day and the night, through food, blood and semen virile.