What does Jude 1:16 mean?
Jude continues his denouncement of false teachers by summarizing their evil character: they grumble and find fault. Their grumbling is likely a constant murmuring against those who proclaim the truth, and they enjoy finding fault with all who believe God's Word. Instead of doing God's will, the false teachers do exactly what their evil instincts prompts them to do.Jesus told the hypocritical Jewish leaders who murmured against Him: "You are of your father the devil, and your will is to do your father's desires. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he lies, he speaks out of his own character, for he is a liar and the father of lies." (John 8:44).
The apostates brag about themselves and compliment others in order to win them to their side. Like those who arrogantly reject God today, the first-century false teachers were egotistical, despisers of God, immoral, and manipulative.