The Epistle of jude
11. Woe unto them! for they have gone in the way of Cain, and ran greedily after the error of Balaam for reward, and perished in the gainsaying of Core.
12. These are spots in your feasts of charity, when they feast with you, feeding themselves without fear: clouds they are without water, carried about of winds; trees whose fruit withereth, without fruit, twice dead, plucked up by the roots;
12. Hi sunt in fraternis vestris conviviis maculae, inter se (vel vobiscum) convivantes, secure pascentes seipsos; nubes aqua carentes, quae a ventis circum aguntur; arbores autummi emarcidae, et eradicata infrugiferae, bis emortuae, et eradicatae;
13. Raging waves of the sea, foaming out their own shame; wandering stars, to whom is reserved the blackness of darkness for ever.
13. Undae efferatae maris, despumantes sua ipserum dedecora; stelie erraticae, quibus caligo tenebrarum in aeternum servata est.
11. Woe unto them. It is a wonder that he inveighs against them so severely, when he had just said that it was not permitted to an angel to bring a railing accusation against Satan. But it was not his purpose to lay down a general rule. He only shewed briefly, by the example of Michael, how intolerable was their madness when they insolently reproached what God honored. It was certainly lawful for Michael to fulminate against Satan his final curse; and we see how vehemently the prophets threatened the ungodly; but when Michael forbore extreme severity (otherwise lawful), what madness was it to observe no moderation towards those excelling in glory? But when he pronounced woe on them, he did not so much imprecate evil on them, but rather reminded them what sort of end awaited them; and he did so, lest they should carry others with them to perdition.
He says that they were the imitators of Cain, who being ungrateful to God and perverting his worship through an ungodly and wicked heart, forfeited his birthright. He says that they were deceived like Balaam by a reward, because they adulterated the doctrine of true religion for the sake of filthy lucre. But the metaphor he uses, expresses something more; for he says that they overflowed, even because their excess was like overflowing water. He says in the third place, that they imitated the contradiction of Core, because they disturbed the order and quietness of the church.
12. These are spots in your feasts of charity. They who read, "among your charities," do not, as I think, sufficiently explain the true meaning. For he calls those feasts charities, (agapais,) which the faithful had among themselves for the sake of testifying their brotherly unity. Such feasts, he says, were disgraced by impure men, who afterwards fed themselves to an excess; for in these there was the greatest frugality and moderation. It was then not right that these gorgers should be admitted, who afterwards indulged themselves to an excess elsewhere.
Some copies have, "Feasting with you," which reading, if approved, has this meaning, that they were not only a disgrace, but that they were also troublesome and expensive, as they crammed themselves without fear, at the public expense of the church. Peter speaks somewhat different, [2 Peter 2:13,] who says that they took delight in errors, and feasted together with the faithful, as though he had said that they acted inconsiderately who cherished such noxious serpents, and that they were very foolish who encouraged their excessive luxury. And at this day I wish there were more judgment in some good men, who, by seeking to be extremely kind to wicked men, bring great damage to the whole church.
Clouds they are without water. The two similitudes found in Peter are here given in one, but to the same purpose, for both condemn vain ostentation: these unprincipled men, though promising much, were yet barren within and empty, like clouds driven by stormy winds, which give hope of rain, but soon vanish into nothing. Peter adds the similitude of a dry and empty fountain; but Jude employs other metaphors for the same end, that they were trees fading, as the vigor of trees in autumn disappears. He then calls them trees unfruitful, rooted up, and twice dead;  as though he had said, that there was no sap within, though leaves might appear.
13. Raging waves of the sea. Why this was added, we may learn more fully from the words of Peter: [2 Peter 2:17,18] it was to shew, that being inflated with pride, they breathed out, or rather cast out the scum of high-flown stuff of words in grandiloquent style. At the same time they brought forth nothing spiritual, their object being on the contrary to make men as stupid as brute animals. Such, as it has been before stated, are the fanatics of our day, who call themselves Libertines. You may justly say that they make only rumbling sounds; for, despising common language, they form for themselves an exotic idiom, I know not what. They seem at one time to carry their disciples above heaven, then they suddenly fall down to beastly errors, for they imagine a state of innocency in which there is no difference between baseness and honesty; they imagine a spiritual life, when fear is extinguished, and when every one heedlessly indulges himself; they imagine that we become gods, because God absorbs the spirits when they quit their bodies. With the more care and reverence ought the simplicity of Scripture to be studied, lest, by reasoning more refinedly than is right, we should not draw men to heaven, but on the contrary be involved in manifold labyrinths. He therefore calls them wandering stars, because they dazzled the eyes by a sort of evanescent light.
 "Twice dead" is deemed by some a proverbial expression to signify what is altogether dead; or, as by Macknight, it means that they were dead when professing Judaism, and dead after having made a profession of the gospel. -- Ed.