How do we know that our sins are pardoned according to the Bible?

The assurance of pardon for our sins is rooted in the New Testament, particularly in Ephesians 1:7, where it declares, 'In whom we have redemption through his blood, the forgiveness of sins, according to the riches of his grace.' This underscores the doctrine of atonement, illustrating that our forgiveness is not earned by our deeds but is a gift through Christ's sacrificial death. This aligns with Isaiah's proclamation, which indicates that God's people have received 'double for all her sins,' reflecting divine grace that exceeds our transgressions. This theme of lavish grace and mercy throughout Scripture reinforces the certainty that those who are united with Christ by faith are fully pardoned and cleansed from sin, ensuring eternal safety and acceptance before God.