अव्यक्तादि स्थूलपर्यन्तमेत -द्विश्वं यत्राभासमात्रं प्रतीतम् ।व्योमप्रख्यं सूक्ष्ममाद्यन्तहीनंब्रह्माद्वैतं यत्तदेवाहमस्मि ॥ ५१३ ॥
In plain words
This whole universe - from the subtlest unmanifest layer down to the grossest physical thing - is only a passing appearance within Brahman. And that Brahman - vast like space, subtle, with no beginning and no end, one without a second - that is exactly what I am.
Close to the Sanskrit
This universe, from the unmanifest down to the gross, in which [Brahman] it appears as a mere semblance - that non-dual Brahman which resembles space, is subtle, without beginning or end - that very [Brahman] I am.