तत्त्वमस्यादिवाक्येषु लक्षणा भागलक्षणा ।सोऽयमित्यादिवाक्यस्थपदयोरिव नापरा ॥ ४८ ॥
In plain words
In sentences like "You are That," the indication at work is partial indication — just as it is with the two words in a sentence like "This is that man." No other kind.
Close to the Sanskrit
In sentences beginning with 'That thou art', the indication is partial indication, like that of the two words standing in sentences beginning with 'This is that'; not any other.