Law and Gospel - John M. Frame

some quotes from this article

The distinction between law and gospel is not a distinction between a false and a true way of salvation. Rather, it is a distinction between two messages, one that supposedly consists exclusively of commands, threats, and therefore terrors, the other that consists exclusively of promises and comforts. Although I believe that we are saved entirely by God’s grace and not by works, I do not believe that there are two entirely different messages of God in Scripture, one exclusively of command (“law”) and the other exclusively of promise (“gospel”). In Scripture itself, commands and promises are typically found together. With God’s promises come commands to repent of sin and believe the promise. The commands, typically, are not merely announcements of judgment, but God’s gracious opportunities to repent of sin and believe in him. As the Psalmist says, “be gracious to me through your law,” Psm. 119:29.

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We should be reminded of course that there is also an opposite extreme: preaching “gospel” in such a way as to suggest that Christ makes no demands on one’s life. We call that “cheap grace” or “easy believism.” We might also call it preaching “gospel without law.” Taken to an extreme, it is antinomianism, the rejection of God’s law. The traditional law/gospel distinction is not itself antinomian, but those who hold it tend to be more sensitive to the dangers of legalism than to the dangers of antinomianism.

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...suggests that when you do something in obedience to a divine command, threat, or promise of reward, it is to that extent tainted, unrighteous, something less than a truly good work. I agree that our best works are tainted by sin, but certainly not for this reason. When Scripture presents us with a command, obedience to that command is a righteous action. Indeed, our righteousness is measured by our obedience to God’s commands. When God threatens punishment, and we turn from wickedness to do what he asks, that is not a sin, but a righteous response. When God promises reward, it is a good thing for us to embrace that reward.