Sakalya said: 'Which is thy deity in the zenith?' Yagnavalkya said: 'Agni.' Sakalya said: 'In what does that Agni abide.' Yagnavalkya said: 'In speech.' Sakalya said: 'And in what does speech abide?' Yagnavalkya said: 'In the heart.' Sakalya said: 'And in what does the heart abide?'

In plain words: Sakalya asks about the god of the sky above. Yagnavalkya says Agni, the fire god, who rests in speech, and speech rests in the heart. Then Sakalya presses further and asks what the heart itself rests on.