स्वात्मन्यनस्तमयसंविदि कल्पितस्यव्योमादिसर्वजगतः प्रददाति सत्ताम् ।स्फूर्तिं स्वकीयमहसा वितनोति साक्षा -द्यद्ब्रह्म तत्त्वमसि केवलबोधमात्रम् ॥ ७७७ ॥
In plain words
That which lends existence to the entire projected universe—beginning with space—within its own unsetting consciousness, and directly illuminates it with its own inherent radiance: that Brahman, which is pure consciousness alone, you are.
Close to the Sanskrit
In the self's non-setting consciousness, of the imagined entire universe beginning with space, (which) grants existence, (and) spreads out illumination by its own splendor directly—that Brahman which is pure consciousness alone, that you are.