बहिर्यात्यन्तरायाति भस्त्रिकावायुवन्मुहुः ।न हितं वाहितं वा स्वमन्यद्वा वेद किञ्चन ॥ ५४८ ॥
In plain words
Out it goes, in it comes, over and over, like air pumped through a bellows. And it knows nothing at all — not what helps, not what harms, not itself, not anything else.
Close to the Sanskrit
It goes out, it comes in, again and again, like the air of a bellows; it does not know anything at all — neither the beneficial nor the harmful, neither itself nor another.