यद्वै तन्न विजानाति विजानन् वै तन्न विजानाति ।न हि विज्ञातुर्विज्ञातेर्विपरिलोपो विद्यतेऽविनाशित्वात् ।न तु तद्द्वितीयमस्ति ततोऽन्यद्विभक्तं यद्विजानीयात् ॥४,३.३० ॥
In plain words
And when it is said that he does not know, he is knowing though he does not know; for there is no cessation of the knowing of the knower, since he is indestructible. But there is no second thing, separate from him, which he could know.