Jude could have described himself as the brother of Jesus and of James. Instead he said that he was the servant of Jesus the Lord and King. This showed that Jude was humble.
Jude told the believers that they were chosen, loved and safe. This would encourage them as they dealt with a danger that the church faced. The danger was that ungodly people were teaching things that weren’t true. They encouraged believers to stop being faithful to the good news.
So Jude wrote to encourage the believers to stand up for the faith. This means to struggle to hold on to what is true about God. It means to work hard to stay faithful to the way God wants people to live. This struggle happens inside of people as they grow in believing and following Jesus. It happens in their relationships with others as they refuse to believe people who teach lies.
One lie that people in Jude’s time taught was about God’s grace. They taught that God’s grace gave them permission to do whatever they wanted. They used this as permission to commit sexual sins. This lie led them to say no to obeying Jesus Christ as Messiah and King.
Peter had also written about people who hated to be under Jesus’ authority (2 Peter 2:10).