How do we know Christ’s sacrifice for sin is sufficient?

Christ's sacrifice is described as fully sufficient for atonement because it meets the requirements of God's justice. Isaiah 53:5 asserts that He was wounded for our transgressions; this implies not only His suffering but also the legal transaction that enables forgiveness. The concept of substitutionary atonement is central to Reformed theology; it teaches that Christ bore the penalty of sin for His people. In God's economy of salvation, no further sacrifice is needed because Christ's one-time offering was perfect and acceptable to God, fully satisfying divine justice. His resurrection further affirms His victory over sin and death, completing the redemptive plan for those who believe.