US-P14.024ab ।US-P14.024cd ॥
In plain words
Take the ātman to be the 'I' that acts, or just as much the one that knows, and what you have grasped is the non-Self, nothing else. Know it instead as free of that identification, and you are the one who knows the Self.
Close to the Sanskrit
He who knows the Self as the I-doer, and likewise he who knows it as the knower — that one is a knower of the non-Self only; he who knows otherwise, he is the knower of the Self.