romans 11:6 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. - Free Bible Online

      6. 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 the other. (See on Ro 4:3, Note 3.)

JFB.