Luther's distinction between law and gospel — the law always accuses and kills, the gospel always gives life — was not merely an academic refinement but a pastoral breakthrough that he credited with liberating him from the despair of medieval penance. In the medieval system, law and grace worked cooperatively: the law defined the standard, and grace enabled the sinner to meet it through the sacramental system. Luther inverted this: the law's role is precisely to drive the sinner to despair of self-effort so that the gospel's unconditional promise can be received. This distinction became the organizing principle of Lutheran hermeneutics and homiletics.
"In direct opposition to the scholastics Paul declares: the law is not of faith. What is this charity the scholastics talk so much about? Does not the Law command charity? The fact is the Law commands nothing but charity" — Luther's sharpest contrast between the scholastic conflation of law and gospel and Paul's insistence that the law belongs to an entirely different register than the promise of faith.
"Every law or commandment contains two profitable points: first, a promise; second, a threatening; for every law is, or should be, good, upright, and holy... It commands that which is good, and forbids that which is evil" — Luther's analysis of law's dual function, showing why law alone cannot save but must be distinguished from the gospel's unconditional promise.
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