How do we know the doctrine of sound words is true?

The doctrine of sound words is firmly rooted in the authority of Scripture, particularly as presented by the apostles. Paul's assertion that the gospel was received directly from Jesus Christ (Galatians 1:11-12) underscores its divine origin. The integrity of the message Paul preached forms the basis upon which believers are to anchor their faith. Throughout the New Testament, particularly in Pauline letters, there is a clear emphasis on the uncorrupted teaching of the gospel as the source of life and faith for believers. Sound words encapsulate the teachings of Christ, emphasizing salvation through grace alone, achieved through Christ's work, and instilled in the hearts of believers by the Holy Spirit.