How do we know God's forgiveness of sins is true?

The truth of God's forgiveness is rooted in the sacrificial work of Jesus Christ, who serves as the propitiation for sin, as described in Romans 3:25. This verse clarifies that God's righteousness is demonstrated through forgiveness, as he remains just while justifying those who have faith in Christ's atoning work. The historical context of Jesus forgiving sins before his crucifixion reveals that God's forgiveness transcends time and is assured through the completed work of Christ, providing confidence for believers in the assurance of their salvation.