How do we know Christ's sacrifice was sufficient for our sins?

The sufficiency of Christ's sacrifice is intricately tied to the doctrines of sovereign grace. According to Galatians 2:21, to suggest that righteousness can be obtained through the law is to declare that Christ died in vain. In essence, His blood was the ultimate payment required to satisfy divine justice, and it is through His resurrection that we see the confirmation of that sacrifice. All Old Testament sacrifices pointed to this final act, indicating that they were temporary and preparatory. When Christ declared on the cross, 'It is finished,' He affirmed that He had completed the work necessary for the redemption of His people. Therefore, for those who are in Christ, there is no condemnation, and His work is wholly sufficient.