How do we know the doctrines of the apostles and prophets are true?

The truth of the doctrines given by the apostles and prophets is derived from their inspiration by the Holy Spirit, as Scripture is God-breathed and authoritative. Passages such as 2 Timothy 3:16 affirm the divine origin of the Scriptures. Furthermore, historical confessions and creeds, such as the Westminster Confession of Faith, encapsulate these doctrines and affirm their validity within the context of historic Reformed theology. The unity of Scripture across the Old and New Testaments continually points to Christ as the fulfillment of God's redemptive plan, providing believers with a robust foundation for their faith.