अथैतस्य मनसो द्यौः शरीरम् ।ज्योतीरूपमसावादित्यः ।तद्यावदेव मनस्तावती द्यौस्तावानसावादित्यः ।तौ मिथुनं समैताम् ।ततः प्राणोऽजायत ।स इन्द्रः ।स एषोऽसपत्नः ।द्वितीयो वै सपत्नः ।नास्य सपत्नो भवति य एवं वेद ॥बृह. १,५.१२ ॥
In plain words
Of that mind the sky is the body, and that sun is its form of light. Therefore, as far as mind reaches, so far reaches the sky and so far that sun. These two came together, and thence the breath was born. That is Indra, and he is without a rival; for a second is a rival. He who knows this has no rival.