Warning against False Teachers: 2: 1-9.
In this chapter Peter warns the believers against false teachers. He draws a contrast between God's Word and the deception of false teaching. Paul warned that false teachers will come from within the Church (Acts 20:29, 30). These are professing Christians secretly bringing destructive heresies along with true doctrines in the church. Peter urges believers to pay close attention to the teachings of the apostles. The common denominator of their heresy is their denial of the deity of Jesus Christ. Also they deny the reliability of the Bible, trinity, the virgin birth of Christ, His bodily resurrection, eternal judgment and the reality of miracles in the Bible. False teachers claim they have special revelation and knowledge of God. They promise freedom but they themselves are slave to sin. They are reformed people but never be born again. False teachers are unclean before they were reformed and unclean after their reformation (2:20-22). This passage does not teach that believer can lose their salvation. Reformation is dangerous because it can give false impression about salvation. God is just, and he will ensure that those who exploit others with lies will not go unpunished. He will punish the wicked but he will rescue the godly (2:9). False teachers will bring upon themselves swift destruction. So Peter warns believers not to fall into their destructive deceptive. They should stand firm in faith.
Marks of false teachers:2:10-22
This is a difficult passage because it appears to imply that those who have been saved can fall away. But a careful reader will note that, as in Hebrews 6:4-9, these people have never actually been freed from their enslavement to sin (2:19). They have given the appearance of being part of the church but turn to their former sinful ways. Their knowledge of Christ was superficial.(2:20). Those who receive gospel with humble heart, it is a mighty force to bring about the supernatural change which can never be reversed. Those who fall away show that they were never truly in Christ. Their hearts are more hardened to the appeal of the gospel because they think they have already been saved (2:20-21). They live according to their natural instinct and speak about things of which they are ignorant.