आत्मा प्रकाशकः स्वच्छो देहस्तामस उच्यते ।तयोरैक्यं प्रपश्यन्ति किमज्ञानमतः परम् ॥ २० ॥
In plain words
The Self is what does the illuminating — clear, with nothing in it to cloud the light. The body is called tāmasa: dark, heavy, inert. And people look at these two and see one thing. What ajñāna could go further than that?
Close to the Sanskrit
The Self is the illuminator, transparent; the body is said to be made of tamas. Of those two they see oneness — what ignorance is greater than this?