How do we know the treasure of the gospel is true?

In 2 Corinthians 4:5-6, Paul emphasizes that 'we preach not ourselves, but Christ Jesus the Lord.' The treasure referred to is fundamentally the transformative knowledge of God’s glory in the face of Jesus Christ. This treasure is confirmed through the gospel's power, which Paul describes as the 'power of God unto salvation' (Romans 1:16). The truth of the gospel resonates within the hearts of believers as God illuminates their understanding, granting them a deeper appreciation of His grace and mercy. Thus, the treasure of the gospel is substantiated not only through scriptural testimony but also through personal experiences of grace and divine revelation.