He asked: 'Who are the six?' Yagnavalkya replied: 'Agni (fire), Prithivi (earth), Vayu (air), Antariksha (sky), Aditya (sun), Dyu (heaven), they are the six, for they are all this, the six.'

In plain words: Yagnavalkya names the six gods: fire, earth, air, sky, sun and heaven. Together these six make up the whole world.