Why is Christ's finished work essential for Christian assurance?

The assurance of salvation for Christians is intimately linked to the finished work of Christ. When Jesus declared, 'It is finished,' He signified that He has completed all necessary aspects of redemption, both fulfilling the law and bearing the wrath of God for the sins of His people. This assurance is vital because it enables believers to rest in the truth that their salvation does not depend on their performance or ability to maintain it but solely on the merits of Christ's obedience and sacrifice. In Hebrews 10:14, we read that by one offering He has perfected forever those who are sanctified. This means that Christians can approach God with confidence, knowing that their acceptance is based on Christ's work rather than their flawed efforts.