How do we know the doctrine of good works is true?

The truth of the doctrine of good works is established primarily through Scripture. Believers are instructed in Titus 3:8 to be careful to maintain good works as these are profitable for mankind. God's law, found in both the Old and New Testaments, defines good works for us. For example, Jesus says in Matthew 5:17-20 that the law remains relevant until all is fulfilled. This illustrates that our understanding of good works must align with the commands of God rather than our own interpretations. Furthermore, Romans 7 explains that the law reveals our sinfulness and need for Christ, highlighting the importance of good works in the life of a believer who has been transformed by grace.