Namely, when we thus perceive by touch the warmth here in the body. And of it we have this audible proof: Namely, when we thus, after stopping our ears, listen to what is like the rolling of a carriage, or the bellowing of an ox, or the sound of a burning fire (within the ears). Let a man meditate on this as the (Brahman) which is seen and heard. He who knows this, becomes conspicuous and celebrated, yea, he becomes celebrated.

In plain words: The proof is the warmth you feel when you touch your body, and the humming sound you hear when you cover your ears. Meditate on these as Brahman, the ultimate reality, that you can feel and hear. Whoever does this becomes noticed and well known.