Vedantasara - Verse 146
Sanskrit
अज्ञानादिव्यष्टिरेतदुपहिताल्पज्ञत्वादिविशिष्टचैतन्यमेत- दनुपहितं चैतत्त्रयं तप्तायःपिण्डवदेकत्वेनावभासमानं त्वम्पदवाच्यार्थो भवति
Swami Nikhilananda's Translation
Individual ignorance and the rest, Consciousness associated with it and endowed with partial knowledge etc., as also the Pure Consciousness unassociated with any attribute – these three when appearing as one and inseparable like a red-hot iron ball, become the primary meaning of the word “Thou”.
Index: Vedantasara

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