How do we know the necessity of church discipline is true?

The teachings of Jesus in Matthew 18 provide a clear framework for addressing offenses among believers, which establishes the need for church discipline. The Lord anticipates that differences will arise and offers a systematic approach to resolving conflicts. This practice is reflected in the early church where issues such as moral failings, divisiveness, and heretical beliefs were addressed through disciplinary measures, as seen in Paul's letters to the Corinthians. Since these Scriptures are authoritative, they affirm that discipline is not optional but essential for the health and unity of the body of Christ.