तावत्सत्यं जगद्भाति शुक्तिकारजतं यथा ।यावन्न ज्ञायते ब्रह्म सर्वाधिष्ठानमद्वयम् ॥ ७ ॥
In plain words
The world goes on looking real for exactly as long as Brahman is not known — Brahman, the ground under everything, without a second. It is the shell on the sand flashing as silver.
Close to the Sanskrit
So long does the world appear real — as silver in the mother-of-pearl shell does — as long as Brahman, the substratum of all, the non-dual, is not known.