Why does Paul contrast law and grace in Galatians?

In his letter to the Galatians, Paul addresses the danger of returning to a works-based righteousness through the law. He argues that if salvation were possible through the law, it negates the promise made to Abraham and the grace of God (Galatians 3:18). The law serves to expose sin and demonstrate human inability to attain righteousness on their own. Paul’s contrast serves to point out the futility of self-righteousness, underscoring that true salvation and life come from faith in Christ alone, who fulfilled the law on our behalf.