Application of Jude
Think about the promises to the "beloved in God." Spend time in prayer, praising God for what He will do on your behalf. Then think of the responsibilities that are yours and talk with God about how you are to fulfill these.
Review the characteristics of the ungodly. Do you know of anyone who fits this description? How does knowing this help you? What are you to do in respect to these people? Are you willing?
Jude Themes of Application
Jude warns against false teachers and leaders who reject the lordship of Christ, undermine the faith of others, and lead them astray. These leaders and any who follow them will be punished.
We must staunchly defend Christian truth. Make sure that you avoid leaders and teachers who distort the Bible to suit their own purposes. Genuine servants of God will faithfully portray Christ in their words and conduct.
Jude also warns against apostasy - turning away from Christ. We are to remember that God punishes rebellion against him. We must be careful not to drift away from a faithful commitment to Christ.
Those who do not seek to know the truth in God’s Word are susceptible to apostasy. Christians must guard against any false teaching that would distract them from the truth preached by the apostles and written in God’s Word.