US-P18.058ab ।US-P18.058cd ॥
In plain words
If the one who says "I" were itself the Self, then the word would mean exactly what it says, directly and with nothing borrowed. But that one hungers, thirsts, and the rest — and the śruti does not grant it selfhood.
Close to the Sanskrit
When there is selfhood of the agent of the notion 'I', then there is primacy of the word's meaning; but because of being possessed of hunger and the rest, its selfhood is not accepted in the śruti.