Sakalya said: 'Whosoever knows that person whose dwelling is ether, whose sight is the ear, whose mind is light,—the principle of every self, he indeed is a teacher, O Yagnavalkya.' Yagnavalkya replied: 'I know that person, the principle of every self, of whom thou speakest. The person who hears and answers, "he is he." But tell me, Sakalya, who is his devata?' Sakalya replied: 'Space.'

In plain words: Sakalya asks about the being whose home is open space and whose sense is the ear. Yagnavalkya says it is the person who hears and answers. Sakalya says its deity is Space.