निषेधे कृते नेति नेतीति वाक्यैःसमाधिस्थितानां यदाभाति पूर्णम् ।अवस्थात्रयातीतमद्वैतमेकंपरं ब्रह्म नित्यं तदेवाहमस्मि ॥ ५ ॥
In plain words
When the negation is complete — 'not this, not this,' sentence after sentence taking everything away — what still shines, full and lacking nothing, for those settled in samādhi: beyond waking, dream and deep sleep, without a second, one, the supreme Brahman, eternal. That, exactly that, is what I am.
Close to the Sanskrit
When negation has been performed by the sentences 'not this, not this,' that which shines forth as full for those established in samādhi — beyond the three states, non-dual, one, the supreme Brahman, eternal — that alone I am.