“To be dead to the law, is not to turn a loose Antinomian; it is to live unto God….
Hence see the reason why the devil opposes the doctrine of grace so much, and cares not though the law, as a covenant, be never so much preached up, because it is the gospel-doctrine that tends only to true godliness, while the law and legal doctrines tend to keep men strangers to the life of God. The devil cares not how much you be in duties, providing you keep off from Christ, who is the end of the law, for righteousness: for then he knows you would be holy also: but he is an unholy devil; and therefore he opposes the gospel, and its doctrine. The devil knows that he hath fast hold of you, so long as you cleave to the law; but that he hath lost you, if once you have laid hold on Christ:
for, if once you get Christ for justification, as having fulfilled the righteousness of the law for you, then you will also get Him for sanctification, to fulfill the righteousness of the law in you.
The devil knows, that though in seeming holiness, you should be transformed to an angel of light, like himself, yet you lie under the heavy vengeance of God, and curse of the law, and under the power of sin too, so long as you are under the law.”
Ralph Erskine, “Law-Death, Gospel-Life,” in The Works of Ralph Erskine, pp. 59-60.