How do we know that forgiveness of sins is guaranteed?

The assurance of forgiveness is built on the foundation of Christ's atoning work on the cross. In Hebrews 9:26, it reveals that Jesus appeared to 'put away sin by the sacrifice of himself,' signifying that our sins will not be brought up against us again. This is echoed in Acts 5:31, where it states that Christ, as a Prince and Savior, offers repentance and forgiveness of sins. The depth of this forgiveness means that it is as if our sins are disposed of, never to be counted against us. It highlights the grace of God, who allows believers to stand righteous in His sight on account of Christ’s finished work.