। ॥ ४ ॥
In plain words
Across waking, dream, and deep sleep, discerned through Anvaya, what remains present, and Vyatireka, what falls away, there is one pure Jñāna—consciousness alone. That I am: the supreme, the vast Brahman.
Close to the Sanskrit
Through Anvaya and Vyatireka—presence and absence—across waking, dream, and deep sleep, that one, pure Jñāna—consciousness alone—that indeed am I, the supreme, the vast Brahman.