How do we know justification by faith alone is true?

The doctrine of justification by faith alone is central to Reformed theology and is vividly illustrated in Romans 5:1, where it states, 'Therefore, having been justified by faith, we have peace with God through our Lord Jesus Christ.' This principle holds that the believer's acceptance before God is based solely on the righteousness of Christ, applied through faith, and not on any merit or works of their own.

In Galatians 5:4, Paul warns that if one seeks justification by the law, they fall from grace. This strongly affirms the sufficiency of Christ's sacrifice, which is the sole basis for justification. Hebrews 10:14 echoes this sentiment, expressing that 'by one offering He hath perfected forever them that are sanctified,' indicating the completeness of Christ's work for our justification. Therefore, our belief in justification by faith alone is deeply rooted in the authority of Scripture and the finished work of Christ, securing our status before God entirely through faith in Him.