Why is Christ alone sufficient for salvation?

The sufficiency of Christ for salvation is foundational in Reformed theology. Christ, as the Good Shepherd, laid down His life for the sheep, which signifies His role as the ultimate sacrificial Lamb who fully satisfied divine justice. His resurrection is the assurance that He accomplished the work of salvation, as indicated in Romans 10:9, which emphasizes belief in His resurrection as central to faith. This truth reinforces that any attempt to add human merit to Christ's work nullifies grace, emphasizing that salvation is entirely through faith in Him.