Jude 1:8

Jude now pinpointed the three errors he had just illustrated and accused the false teachers of all three: lust (Judges 1:7), rebellion (Judges 1:5), and irreverence (Judges 1:6). "By dreaming" probably refers to all three errors. Jude probably meant that the false teachers justified their actions by citing visions and dreams they claimed to have had (cf. Colossians 2:18).

"Their perverted views and unrestrained conduct made them like dreamers living in the arbitrary fancies of their own imagination; they substituted the unreal world of their fancies for the real world of divine truth and righteousness." [Note: Ibid., p. 243.]