Why is the completion of Christ's work important for Christians?

The completion of Christ’s work on the cross is crucial for Christians because it affirms that salvation is entirely God's work, not based on human effort. The declaration 'It is finished' ensures that all the demands of the law have been satisfied in Christ, thereby liberating believers from the burden of trying to earn their way to God. This doctrine fosters assurance and peace, allowing believers to rest in the finished work of Jesus, who has done what we could never do for ourselves. Furthermore, it highlights the grace of God in choosing us and granting us faith to believe.