Romans 11:6

“And if by grace, then is it no more of works, etc..] Upon election, being called “the election of grace”, the apostle forms an argument, showing the contrariety and inconsistency of grace, and works, in that affair; proving, that it must be by the one or the other: and if by the one, then not by the other; and that these two cannot be mixed and blended together in this matter. If election is “by grace”, as it certainly is; for no other reason can be given why God has chose one, and not another, but his own sovereign pleasure, or that free favour and unmerited love, with which he loves one and not another; and not because they are better, or had done or would do better things than others;…”

“And, &c.--better, "Now if it (the election) be by grace, it is no more of works; for [then] grace becomes no more grace: but if it be of works," &c. (The authority of ancient manuscripts against this latter clause, as superfluous and not originally in the text, though strong, is not sufficient, we think, to justify its exclusion. Such seeming redundancies are not unusual with our apostle). The general position here laid down is of vital importance: That there are but two possible sources of salvation--men's works, and God's grace; and that these are so essentially distinct and opposite, that salvation cannot be of any combination or mixture of both, but must be wholly either of the one or of…”

“And if grace ... - If the fact that any are reserved be by grace, or favor, then it cannot be as a reward of merit. Paul thus takes occasion incidentally to combat a favorite notion of the Jews, that we are justified by obedience to the Law. He reminds them that in the time of Elijah it was because God had reserved them; that the same was the case now; and therefore their doctrine of merit could not be true; see Romans 4:4-5; Galatians 5:4; Ephesians 2:8-9. Otherwise grace ... - If people are justified by their works, it could not be a matter of favor, but was a debt. If it could be that the doctrine of justification by grace could be held and yet at the same time that the Jewish doctrine of…”

“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. Romans 11:7”

“And if: Rom 3:27, Rom 3:28, Rom 4:4, Rom 4:5, Rom 5:20, Rom 5:21; Deu 9:4-6; Co1 15:10; Gal 2:21, Gal 5:4; Eph 2:4-9; Ti2 1:9; Tit 3:5 otherwise work: That is, it loses its character, or nature - that of claiming reward as a matter of right. Romans 11:7”