How do we know that Christ's work is sufficient for our salvation?

The sufficiency of Christ's work for our salvation is grounded in the doctrine of imputed righteousness, as articulated in Romans 3:21-26. Christ's obedience, culminating in His death on the cross, served as the perfect substitute for sinners. He bore the sins of His people, satisfying God's justice and securing their salvation. Unlike salvation based on human effort or decision-making, Christ's work is a finished and perfect sacrifice that guarantees the justification of all whom the Father has given Him. Thus, faith in Christ alone—not any act of our own—assures us of salvation.