As the all-pervading ether is not tainted, because of its subtlety, so too the Self, seated everywhere in the body, is not tainted.

yathā = as; sarvagataṃ = all-pervading; saukṣmyāt = due to being subtle; ākāśaṃ = the sky; na = never; upalipyate = mixes; sarvatra = everywhere; avasthitaḥ = situated; dehe = in the body; tathā = so; ātmā = the self; na = never; upalipyate = mixes.;