Keepयदि त्वमात्मनात्मानमधिगच्छसि तं स्वयम् ।एतत्प्रश्नोत्तरं साधु जानास्यत्र न संशयःIn plain wordsIf you yourself attain that ātman by ātman, you will surely come to know well this answer to your question — of this there is no doubt.