How do we know that Jesus' sacrifice is effective for redemption?

The effectiveness of Jesus’ sacrifice is demonstrated through the doctrine of particular redemption, which asserts that Christ’s atonement was intentionally applied to those whom the Father chose. In Exodus 12, God established that when He saw the blood, He would pass over the house, ensuring protection. Similarly, in the New Testament, passages such as 1 Peter 1:18-19 indicate that we were redeemed not with perishable things but with the precious blood of Christ, a lamb without blemish. This assurance is foundational, as it emphasizes that the blood of Christ does not merely provide a potential redemption but a definite and accomplished one. If the blood of Christ has been applied to a believer’s heart, they are assured that their sins are purged, and they will not face judgment.