I have never read all of Jude so today I did.

You can read it in your own Bible, or Here.

But I want to remind you, though you once knew this, that the Lord, having saved the people out of the land of Egypt, afterward destroyed those who did not believe.  And the angels who did not keep their proper domain, but left their own abode, He has reserved in everlasting chains under darkness for the judgment of the great day;  as Sodom and Gomorrah, and the cities around them in a similar manner to these, having given themselves over to sexual immorality and gone after strange flesh, are set forth as an example, suffering the vengeance of eternal fire.

 Likewise also these dreamers defile the flesh, reject authority, and speak evil of dignitaries. Yet Michael the archangel, in contending with the devil, when he disputed about the body of Moses, dared not bring against him a reviling accusation, but said, “The Lord rebuke you!”  But these speak evil of whatever they do not know; and whatever they know naturally, like brute beasts, in these things they corrupt themselves.  Woe to them! For they have gone in the way of Cain, have run greedily in the error of Balaam for profit, and perished in the rebellion of Korah.

Here, Jude is encouraging the righteous. He is saying, "Take heart, the wicked will be punished by the Lord. He will deal with them."
"Even the Arch angel, the very top angel decided to wait upon the Lord's judgment, than to rebuke Satan Himself."

There is something I really like about this book, and that is, It feels so personal.
In some of the other letters of John and paul, I don't feel like they are talking to me, they are just talking to the church. But this feel very personal and very relevant.
And its encouraging.