How do we know that Christ's work on the cross was sufficient?

The sufficiency of Christ's work is a foundational doctrine within Reformed theology. In Romans 8:2-4, Paul articulates that the law could not save, highlighting human inability, but God sent His Son to fulfill the law's demands. When Christ cried 'It is finished,' this signified not just the completion of His suffering but the total satisfaction of God's justice on behalf of sinners. This means that for those who believe, their debt has been wiped clean, and they are no longer under condemnation. This truth brings immense comfort to believers, ensuring that their status before God is secure, resting on the finished work of Christ rather than their own efforts.