US-P18.077ab ।US-P18.077cd ॥
In plain words
The doer cannot take hold of Being as 'I am Being, the witness'. And 'You are Being, nothing else': a false statement is not something that fits the śruti either.
Close to the Sanskrit
An agent is not fit to grasp Being as 'I am Being, the witness'. Nor is it reasonable for śruti to speak falsely in saying 'You are Being alone'.