How do we know justification is true in Christianity?

The assurance of justification in Christianity is firmly established through God's Word. Romans 5:1 states, 'Therefore, having been justified by faith, we have peace with God through our Lord Jesus Christ.' This peace stems from Christ's atoning sacrifice, confirming that through Him, believers are not merely pardoned but declared righteous. Furthermore, 2 Corinthians 5:10 illustrates that every believer will appear before the judgment seat of Christ, where their standing is not based on their deeds but on Christ’s righteousness. This unshakeable truth is why believers can fully trust in their justified status before God.