How do we know that justification is by faith and not by the law?

The Apostle Paul writes extensively about justification in letters such as Romans and Galatians. He asserts that by the works of the law, no human being will be justified in God’s sight because the law reveals sin without providing a means for redemption (Romans 3:20). Instead, justification comes through faith in Jesus Christ, who fulfilled the law perfectly and offers His righteousness to those who believe (Romans 5:1). Furthermore, Galatians 2:21 emphasizes that if righteousness could be gained through the law, then Christ's sacrifice would have been pointless. Thus, the Scriptures clearly affirm that faith in Jesus Christ is the only way we can stand justified before God, freeing us from the condemnation of the law.