In this part of the series on the book of Jude, Chris Montgomery delves into verses 17-23, emphasizing the importance of remembering apostolic teachings and staying true to the gospel. The sermon highlights how false teachers create divisions and the need for believers to keep themselves in God's love through faith, prayer, and hope. It concludes with a call to show mercy to those affected by false teachings, urging the church to be conduits of God's mercy.