Note these quotations from Manton:
1. Faith does not justify as a mutual cause together with works, as if they did co-operate together; but we must distinguish. There is a first and second justification, the one ascribed to faith, the other to works. This opinion maketh as if we were beholden to grace only for some courtesies, where we cannot engage God of ourselves. It is true James saith, ‘Not by faith, but by works;’ but that is only to justify faith. It is a false faith that doth not end in works; but works have nothing to do in justification. God abhorreth such a profane medley; he would have it wholly of grace. The papists exact an imaginary faith, and so are put upon a necessity of eking it out with works. The Complete Works of Thomas Manton (Vol. 3, p. 440).
and here:
1. The Papists say that Paul speaketh of the first justification, by which a man, if unjust, is made just; and that by works he understandeth works done without faith and grace, by the sole power and force of free-will. But James speaketh of the second justification, whereby of just he is made more just; and by works he understandeth such as are performed in faith, and by the help of divine grace. To this I answer—(1.) That it confoundeth justification with sanctification. (2.) That the distinction is false, and hath no ground in scripture. We can merit nothing after we are in a good estate, and are saved by grace all our lives: Rom. 1:17, ‘the righteousness of God is revealed from faith to faith, for the just shall live by faith.’ If the righteousness whereby a sinner is justified be wholly absolved by faith, there is no place for works at all. But the apostle saith, throughout the whole life it is revealed from faith to faith; besides, the apostle Paul excludeth all works, even those done by grace. It is true, this error is less than that of the Pelagians, who said that by natural abilities the law might be kept to justification. However, it is not enough to ascribe justificatory works to the grace of God. So did the Pharisee: Luke 18:11, 12, ‘God, I thank thee,’ not myself. Yet he went not away justified. It is ill to associate nature with grace, and to make man a coadjutor in that in which God will have the sole glory. (3.) It is little less than blasphemy to say, We are more just by our own works than by the merits of Christ received by faith;3 for to that justification, whereby a man is made more just, they admit works. (4.) The phrase of being more just suiteth not with the scope of the apostle, who doth not show how our righteousness is increased, but who hath an interest in it. Neither will the adversaries grant that those against whom the apostle disputeth had a first and real righteousness; and beside, it is contradicted by the example of Rahab, who, according to their explication, cannot be said to be justified in their second way of justification, and yet in our apostle’s sense she is justified by works; and therefore the Popish gloss will not remove the seeming contrariety between the apostles. The Complete Works of Thomas Manton (Vol. 04, pp. 261–262).