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Chapter 30 describes the role of church officers, who are appointed by Christ to govern the church. These officers hold the keys of the kingdom, giving them power to discipline church members through admonition, suspension from the Lord's Supper for a period of time, and excommunication, according to the severity of the offense. Church discipline is for the purpose of leading sinful church members to repentance, deterring others from similar behavior, vindicating the honor of Christ, and preventing the wrath of God from falling on the entire church.