John Calvin Commentary Jude 1:16

"These are murmurers, complainers, walking after their lusts (and their mouth speaketh great swelling [words]), showing respect of persons for the sake of advantage." — Jude 1:16 (ASV)

These are murmurers. Those who indulge their depraved lusts are hard to please and morose, so that they are never satisfied. This is why they always murmur and complain, however kindly good men may treat them.

He condemns their proud language, because they haughtily made a boast of themselves; yet, at the same time, he shows that they were base in their disposition, for they were servilely submissive for the sake of gain. And, commonly, this sort of inconsistency is seen in unprincipled men of this kind. When there is no one to check their insolence, or when there is nothing that stands in their way, their pride is intolerable, so that they imperiously arrogate everything to themselves; but they meanly flatter those whom they fear and from whom they expect some advantage.

He takes persons as signifying eternal greatness and power.