Commentaries:
The word translated "destructive" or "pernicious" (KJV) is more accurately translated "lascivious." Lascivious means "to excite to lust or lewdness." These heresies will seem to provide something we carnally consider very desirable for our well-being. But, all the while, the liberties (verse 19) they promise in their false teachings will be so destructive that they only serve to deny Jesus Christ (verse 1).
John W. Ritenbaugh
Damnable Heresies
These verses show us in a general way that traitors will come from within the church and subvert many to follow their carnal ways. Peter uses the word "but" to provide a contrast with the preceding section about the "sure word of prophecy" (II Peter 1:19, KJV). These traitors to the faith are not led by the Holy Spirit as were those God inspired to write the prophecies (verse 21). The apostle immediately warns that these "false teachers" will come from within the church, or as Peter writes, "among you." The implication is that "forewarned is forearmed"! Therefore, be on guard!
John W. Ritenbaugh
Damnable Heresies
Destructive will also translate into the English word "pernicious," which means "deadly." We hear it most frequently in a medical term, "pernicious anemia." What is so interesting is that it may appear innocent, but all the while it is destroying life. It gives the appearance of being not overtly or openly dangerous, but all the while it is undermining one's health. Peter, of course, is talking about spiritual health.
John W. Ritenbaugh
Satan (Part 4)
These ungodly people turn the church into a commercial operation. These are men of evil ambition; they are covetous. Their primary objective is success in argument, not truth. They make changes in order to exploit. This is the reason for the feigned words and the deceptive or phony arguments.
We in the United States, especially, have been conditioned to be tolerant. But, from what is written in II Peter 2 and Jude, it is clear that God is not tolerant of this kind of thing. We are tolerant because we have lost, or we never had, a sense of the diabolical danger of Satan's false teaching. It leads people to their deaths! As a nation, we have become dulled to the distinction between truth and falsehood, not only in terms of right and wrong in behavior, but also in terms of ideas or concepts.
John W. Ritenbaugh
Satan (Part 4)
Other Forerunner Commentary entries containing 2 Peter 2:2:
Matthew 13:24-30
Luke 15:8-10
2 Thessalonians 2:3
2 Peter 2:1