'He who dwells in the seed, and within the seed, whom the seed does not know, whose body the seed is, and who pulls (rules) the seed within, he is thy Self, the puller (ruler) within, the immortal; unseen, but seeing; unheard, but hearing; unperceived, but perceiving; unknown, but knowing. There is no other seer but he, there is no other hearer but he, there is no other perceiver but he, there is no other knower but he. This is thy Self, the ruler within, the immortal. Everything else is of evil.' After that Uddalaka Aruni held his peace.

In plain words: Yagnavalkya says the inner guide also lives in the seed of life. It cannot be seen, heard or known, yet it is the one that sees, hears and knows in everyone. It alone is your undying Self, and everything apart from it brings suffering. After this, the sage Uddalaka Aruni, who had asked the question, fell silent.