Sakalya said: 'Whosoever knows that person whose dwelling is seed, whose sight is the heart, 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 filial person, "he is he." But tell me, Sakalya, who is his devata?' Sakalya replied: 'Pragapati.'

In plain words: Sakalya asks about the being whose home is seed. Yagnavalkya says it is the son, the person born from a parent. Sakalya says its deity is Pragapati, the lord of creatures.