यो मनसि तिष्ठन्मनसोऽन्तरो यं मनोन वेद यस्य मनः शरीरं यो मनोऽन्तरोयमयत्येष त आत्मान्तर्याम्यमृतः ॥ २० ॥
In plain words
The one who lives inside your mind, yet is nothing the mind can claim as its own, whom the mind itself never knows, whose body the mind is, who governs it from within -- that is your self, the ruler seated inside everything, and death does not touch him.
Close to the Sanskrit
He who, dwelling in the mind, is other than the mind, whom the mind does not know, whose body the mind is, who controls the mind from within -- he is your self, the inner controller, immortal.