How do we know Christ's sacrifice was effective?

We know Christ's sacrifice was effective because it fulfilled all the requirements of the law and accomplished the redemption of His people. As noted in the sermon, Christ's death secured not only the remission of sins but also eternal life for all whom the Father has given Him. Scriptures such as Matthew 26:28 affirm that His blood was shed for many for the remission of sins, and John 3:16 assures us that those who believe in Him will have everlasting life. The nature of Christ's sacrifice as a perfect offering, and the promises of Scripture that confirm its efficacy, bolster our confidence in the sufficiency of His atonement. Therefore, Christ's work on the cross stands as the definitive means by which His people are redeemed.