Śatapatha Brāhmaṇa ("of a hundred paths") 1.9.3.16

1.9.3.16

athāvartate | sūryasyāvṛtamanavāvarta iti tadetāṃ gatimetām pratiṣṭhāṃ gatvaitasyaivāvṛtamanvāvartate

He looks up, with the text (Vâg. S. II, 26 a), 'Self-existent art thou, the best ray of light!' The sun is indeed the best ray of light, and therefore he says, 'Self-existent art thou, the best ray of light.' '"Light-bestowing art thou: give me light (varkas)!" so say I,' said Yâgñavalkya, 'for at this indeed the Brâhmana should strive, that he be brahmavarkasin (illumed by the brahma, or sacred writ).' Aupoditeya, on the other hand, said, 'He indeed will give me cows: (therefore I say), "Cow-giving art thou, give me cows!"' Thus whatever wish he (the sacrificer) entertains (and expresses), that wish is granted to him.