। ॥ १ ॥
In plain words
The Teaching of Reality. To clear away what clings to the two words 'that' and 'you', the teacher said this to his student: In the sentence tat tvam asi — that you are — sift out, right here, what the word 'you' actually means.
Close to the Sanskrit
The Teaching of Reality. For the sake of the purification of the meanings of the words 'tat' and 'tvam', the teacher spoke this word to the student: in the sentence 'tat tvam asi', here, discriminate the meaning of the word 'tvam'.