What does Jude 1:14 mean?

This verse is interesting for providing a quote from one of mankind's earliest patriarchs, Enoch. Jude relates a statement made by Enoch concerning the fate of the ungodly apostates. Although Enoch was not a writer of Scripture, the Holy Spirit guided Jude to quote from Enoch, who lived before Noah's flood (2 Peter 1:21). Genesis 5:24 credits Enoch with walking with God before God took him away from earth, apparently without dying, to be with the Lord. Enoch's prediction is quoted in verses 14 and 15 as a prophecy that is yet to be fulfilled. Enoch predicted that the Lord will return to earth with a myriad of "holy ones." This seems to refer to angels and raptured Christians (Matthew 25:31; Colossians 3:4).

We are not exactly sure where this quotation comes from, or if it was part of some other Jewish writing before being recorded here. At the time Jude wrote, Jewish literature included a non-inspired book, The Book of Enoch, which contains a similar statement. Jude's phrasing is significantly different, however, leading many to suggest that he was either quoting an oral tradition, or had been given particular information by the Holy Spirit. Writers of Scripture often quoted from non-inspired texts for the sake of making a point (Titus 1:12), so this reference does not imply that Jude accepted The Book of Enoch as God's Word.