। ॥ १५७ ॥
In plain words
If there were a real distinction between the one who reaches and that which is reached, then the object would be secured by the subject. But Brahman is simply the attainer's own true nature; it is never something to be attained.
Close to the Sanskrit
If difference of the attainer and the attainable exists, and the attainable is attained by the attainer; this Brahman is indeed the very nature of the attainer, not attainable at any time.