How do we know Christ's sacrifice is effective for our salvation?

The assurance of Christ's sacrifice being effective for our salvation is rooted in the fulfillment of God's covenant promises. Isaiah 53 vividly describes the suffering servant who bore our iniquities, demonstrating that the Messiah took upon Himself the penalty for sin. In Romans 8, we see that those who are called according to God's purpose are justified, emphasizing that Christ's death is not just an event, but a divine necessity for our redemption. Furthermore, the resurrection confirms that His sacrifice was accepted by the Father, providing believers with confidence that they are redeemed in Him.