In The Beginning

Brihadaranyaka Upanishad, First Adhyaya, Fourth Brahmana, 1-5:

1. In the beginning this was Self alone, in the shape of a person (purusha). He looking round saw nothing but his Self. He first said, 'This is I;' therefore he became I by name. Therefore even now, if a man is asked, he first says, 'This is I,' and then pronounces the other name which he may have. And because before (pûrva) all this, he (the Self) burnt down (ush) all evils, therefore he was a person (pur-usha). Verily he who knows this, burns down every one who tries to be before him.

2. He feared, and therefore any one who is lonely fears. He thought, 'As there is nothing but myself, why should I fear?' Thence his fear passed away. For what should he have feared? Verily fear arises from a second only.

3. But he felt no delight. Therefore a man who is lonely feels no delight. He wished for a second. He was so large as man and wife together. He then made this his Self to fall in two (pat), and thence arose husband (pati) and wife (patnî). Therefore Yâgñavalkya said: 'We two are thus (each of us) like half a shell.' Therefore the void which was there, is filled by the wife. He embraced her, and men were born.

4. She thought, 'How can he embrace me, after having produced me from himself? I shall hide myself.'

She then became a cow, the other became a bull and embraced her, and hence cows were born. The one became a mare, the other a stallion; the one a male ass, the other a female ass. He embraced her, and hence one-hoofed animals were born. The one became a she-goat, the other a he-goat; the one became a ewe, the other a ram. He embraced her, and hence goats and sheep were born. And thus he created everything that exists in pairs, down to the ants.

5. He knew, 'I indeed am this creation, for I created all this.' Hence he became the creation, and he who knows this lives in this his creation.