तद्यत्रैतत्सुप्तः समस्तः संप्रसन्नः स्वप्नंन विजानात्येष आत्मेति होवाचैतदमृत-मभयमेतद्ब्रह्मेति स ह शान्तहृदयः प्रव-व्राज स हाप्राप्यैव देवानेतद्भयं ददर्शनाह खल्वयमेवँ संप्रत्यात्मानं जाना-त्ययमहमस्मीति नो एवेमानि भूतानिविनाशमेवापीतो भवति नाहमत्र भोग्यंपश्यामीति ॥ १ ॥
In plain words
'Where a person is fast asleep, gathered inward, serene, and knows no dreams—that is the Self,' he said, 'the immortal, the fearless, that is Brahman.' Indra walked away with a peaceful heart, but before reaching the gods, a great doubt struck him: 'In truth, this sleeper does not know himself as "I am this," nor does he know these beings. He appears to have slipped into mere annihilation. I see nothing here that can be enjoyed.'
Close to the Sanskrit
Now where this one is asleep, gathered, completely serene, and does not know dreams—this is the Self, thus he said; this is the immortal, the fearless, this is Brahman. He with a peaceful heart departed. He, without even reaching the gods, saw this fear: 'Indeed, this one does not now know himself as "I am this", nor these beings. He becomes one who has gone to destruction indeed. I see no enjoyable thing here.'