How do we know that Christ's atonement is sufficient for the elect?
Answered in 1 source
Christ's atonement is sufficient for the elect as it fully satisfies the demands of the law and secures their redemption, as affirmed in 2 Corinthians 5:21.
The sufficiency of Christ's atonement for the elect is grounded in His perfect fulfillment of the law and the divine justice of God. In 2 Corinthians 5:21, we learn that God made Christ, who knew no sin, to be sin for us, so that we might become the righteousness of God in Him. This transaction is a complete legal work whereby Christ, acting as our substitute, bore the full weight of our sin and guilt. Therefore, His atoning work is not only sufficient but also efficient, ensuring that all for whom He died will ultimately be saved, as His payment is fully accepted by God the Father.
Commentary