What does Jude 1:22 mean?

This verse emphasizes a distinction between those who sincerely "doubt," as opposed to those who are rebellious and arrogant: the "scoffers" who are not really seeking truth (Jude 1:10). Jude encourages his readers to show mercy to those who have doubts, perhaps doubts sown by the apostates concerning the truth. This was a key danger presented by Jude, that the presence of false teachers was like a "hidden reef" among the members of the church (Jude 1:12). The key attitude Jude presents here is mercy—a caring compassion—instead of a judgmental anger or rejection.

Strong believers should deal with doubters patiently and with love (Ephesians 4:2). Harsh criticism only drives doubters farther away from the truth. Some doubters might be on the verge of trusting in Jesus as their Savior, but they have intellectual questions. Believers can answer those concerns (1 Peter 3:15–16) if they extend enough mercy to those sincere seekers.