“And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then is it no more grace: otherwise work is no more work.”
King James Version (KJV)
11:6 And if by grace, then it is no more of works - Whether ceremonial or moral. Else grace is no longer grace - The very nature of grace is lost. And if it be of works, then it is no more grace: else work is no longer work - But the very nature of it is destroyed. There is something so absolutely inconsistent between the being justified by grace, and the being justified by works, that, if you suppose either, you of necessity exclude the other. For what is given to works is the payment of a debt; whereas grace implies an unmerited favour. So that the same benefit cannot, in the very nature of things, be derived from both.
Ro 11:6 If by grace, then [is it] no more of works. The salvation of the gospel is by grace. that is, it is the gift which springs from the love of God. If that be true, it is not to be earned by the works of the Jewish law. Paul is very emphatic is showing that the Jewish Christians were saved, not because they deserved it on account of keeping the law blameless, but because they accepted the offered mercy of God.