The book of Jude urges his readers to stand firm against the false teaching brought by immoral people (Jude 3–4). Certain individuals had mixed in with believers, bringing ungodly practices and lifestyles with them. Jude 19 says these people were dividing believers and lacked any presence of the Holy Spirit within them. Jude says plainly that those who choose to live apart from God, slander Him, and commit ungodly acts without repentance will incur God's ultimate wrath and eternal punishment (Jude 15). Jude encourages faithful believers to keep themselves strong in their faith through prayer in the Holy Spirit and to continue awaiting their promised eternal life (Jude 20–21). Believers are instructed to show mercy to those struggling with doubt and to be diligent in taking the saving message of the Gospel to those apart from God (Jude 23). While doing this, they are told to avoid even the slightest association with anything corrupted by evil and sin. Jude ends his letter by expressing hope to believers and reminding them that God is able to keep them from stumbling and to keep them pure in His sight through their belief in Christ (Jude 24).
The actions of the false teachers Jude writes about are present in the world still and can easily overtake any believer. The direction Jude gives his readers for handling these influences is useful to us today. Jude begins his letter as if he had intended to write about a different topic, but then recognizes the urgency of addressing the real problem his readers are facing. The word "contend" (Jude 3) conveys the seriousness of how believers must handle the evil influences in their midst. This should be our mindset as well when faced with immoral influences within the body of believers. We are given the reminder that, just because God's grace is sufficient to cover all sin, we are not to simply go on sinning freely because of the promise of forgiveness (Jude 4, Romans 6:1-2).
Our response to God's mercy and love should be to live according to His Word, no longer continuing in our own way. We are to avoid all evil, selfish, and immoral influences that would cause us to stumble in our faith. Jude's encouragement at the end of his letter is ours as well: to remain faithful in prayer, to keep the hope of heaven, and to stay connected to God. We can help other believers who are doubting their faith and strengthen them, but we should exercise caution when interacting with people who might tempt us toward things that are not from God.