स य एषोऽणिमैतदात्म्यमिदं सर्वँतत्सत्यँ स आत्मा तत्त्वमसि श्वेतकेतोइति भूय एव मा भगवान्विज्ञापयत्वितितथा सोम्येति होवाच ॥ ६ ॥
In plain words
'That which is this subtle essence—this whole universe has its being in it. That is the truth, that is the Self. You are that, O Śvetaketu.' Pray explain this to me once more, revered sir. So spoke the father, 'So be it, gentle one.'
Close to the Sanskrit
That which is this subtle essence, this entire universe has that as its Self. That is the truth, that is the Self, 'You are that, O Śvetaketu' -- thus may the venerable one explain this to me again, thus. Thus, gentle one, spoke he.