। ॥
In plain words
Therefore: if you were a separate soul by your own nature, you would be a separate soul always. And if by your own nature you are the supreme Self, then the fitting thing to say is exactly this — that this one, here, is the supreme Self and nothing else.
Close to the Sanskrit
Therefore, if by its own nature it were the jīva, then it would always be the jīva alone. Thus likewise, if by its own nature it is the supreme Self, then 'this one is the supreme Self alone' — this would be the fitting statement.