How do we know that Jesus' sacrifice was effective?
Answered in 2 sources
Jesus' sacrifice is affirmed in Scripture by its fulfillment of prophecy and its results: the forgiveness of sins and the offering of peace with God.
The effectiveness of Jesus' sacrifice is rooted in the fulfillment of God's promises and the profound results it yields. Psalm 85 highlights how God has turned away His anger (verse 3) and offers revival and salvation (verse 6). The cross of Christ accomplished the transfer of sin and righteousness — as God's wrath was satisfied through Christ's suffering, believers now have peace with God. Furthermore, the additional truths that righteousness and peace meet at the cross solidify the effectiveness of Christ's sacrifice. When God the Father assessed Christ on the cross, He imputed our sins to Him, providing complete redemption for His people.
Commentary