How does Christ's finished work provide assurance?

The assurance of a believer rests wholly on the completed work of Jesus Christ, who fulfilled the law perfectly on behalf of sinners. His sacrificial death and resurrection secured eternal redemption, as confirmed in Hebrews 10:14, stating He has perfected forever those who are sanctified. By relying on Christ's work rather than our own, believers can rest in the promise of eternal life. This understanding alleviates fears of losing salvation, as it is grounded in Christ's righteousness, not our imperfect efforts, leading to a profound sense of peace and security in God’s presence.