How do we know that Christians are saved by grace?

Christianity emphasizes that salvation is by grace alone, rooted in the belief that no sinner can achieve righteousness through their own efforts. Romans 3:10 states that none are righteous on their own, and only through faith in Jesus Christ and His work can believers be declared righteous before God. This principle is a core tenet of Reformed theology, affirming that it is God’s grace and mercy, not human effort, that secures salvation. True believers acknowledge their inherent sinfulness and unworthiness, relying solely on Christ for redemption.