For certain men have secretly infiltrated [your ranks]; they are men who had been written about long ago that they should be judged [and condemned] for perverting the unearned favor of our God into [a license for] living unrestrained, indecent lives, and who deny [the identity and work of] our only Master and Lord, Jesus Christ.

And angels, who did not remain within [the bounds of] their proper authority, but left their own realm, God has kept in perpetual bondage, under [thick] darkness, awaiting judgment on the Great Day [when they will be punished].

In the same way, these people have dreams of committing physically corruptive practices; they reject authority over them [i.e., by both God and men], and speak against glorious [i.e., heavenly] beings.

But these people [i.e., the "certain men" of verse 4] speak against whatever they do not understand, and what they do understand naturally, the way animals do, proves to be their ruination.

It is too bad for these people, for they have followed the example of Cain [the murderer]; for the sake of money they have rushed into the [same] error as Balaam committed [See Num. 25:1-5; 31:16]; they [will] perish [spiritually] for having rebelled [against God] like Korah did. [See Num. 16:1-3, 31-35].

These people are like rotten spots [contaminating the food] at your love feasts, while they gorge themselves without fear [i.e., unashamed of their selfish indulgence]. [Note: This passage may mean "like selfish shepherds, looking out only for themselves, they eat the grain set out for the animals"]. They are like clouds that blow over without producing rain; [they are like] trees in the fall that do not produce any fruit and have been uprooted, [thus] being dead twice [i.e., fruitless and rootless].

[They are like] raging ocean waves, whose shameful actions bubble up like foam. [They are like] shooting stars [whose light quickly goes out], for whom total darkness has been reserved forever.

to bring judgment upon all [such people], and to convict every person of their ungodly behavior, which they have wickedly committed, and of all the evil things that [such] ungodly sinners have spoken against God."

for they were saying to you people, "In the last times [See I John 2:18; Heb. 1:1-2] there will be mockers [arise], who will live according to their [own] ungodly desires."

These are people who cause divisions [among God's people]; they follow their natural inclinations [i.e., worldly principles], for they do not have the Holy Spirit [in their lives].

And you should show pity toward some people because they have doubts [regarding spiritual matters];