These are murmurers and complainers, walking after their lusts (and their mouth speaks proud things), showing respect of persons to gain advantage.
A murmuring, complaining spirit marks a weak or wicked man; such people rail against God's providence and men's conduct, never content with their state. Those enslaved to sinful appetites are most prone to ungovernable passions. But remember what the apostles foretold, their rise in the Church confirms your faith rather than shakes it, and you must think it no strange thing.
AI summary
Commenting on Jude 1:16-25
Verse 16. These are murmurers. The word here used does not elsewhere occur, though the word murmur is frequent, ; . Comp. ; . The sense is that of repining or complaining under the allotments of Providence, or finding fault with God's plans, and purposes, and doings. Complainers.
16. These are murmurers. They who indulge their depraved lusts, are hard to please, and morose, so that they are never satisfied. Hence it is, that they always murmur and complain, however kindly good men may treat them. We may render the words “Grumblers and fault-finders,” that is, as the word means, with their own lot: they grumbled or murmured against others, and were discontented...