¹ This is now the second letter that I am writing to you, beloved. In both of them I am stirring up your sincere mind by way of reminder, ² that you should remember the predictions of the holy prophets and the commandment of the Lord and Savior through your apostles, ³ knowing this first of all, that scoffers will come in the last days with scoffing, following their own sinful desires. ⁴ They will say, “Where is the promise of his coming? For ever since the fathers fell asleep, all things are continuing as they were from the beginning of creation.” ⁵ For they deliberately overlook this fact, that the heavens existed long ago, and the earth was formed out of water and through water by the word of God, ⁶ and that by means of these the world that then existed was deluged with water and perished. ⁷ But by the same word the heavens and earth that now exist are stored up for fire, being kept until the day of judgment and destruction of the ungodly. – 2 Peter 3:1-7 ESV

Peter feared that the “destructive heresies” (2 Peter 2:1 ESV) of the false teachers would take their toll on those who were spiritually immature. He even declared that these men “entice unsteady souls” (2 Peter 2:14 ESV) and lead them down a path of destruction. Driven by greed and the need for power and influence, these false teachers will say anything that might entrap the weak-willed and spiritually vulnerable.

With an appeal to twisted sexual desires, they lure back into sin those who have barely escaped from a lifestyle of deception. – 2 Peter 2:18 NLT

Peter seems to indicate that the ones most susceptible to these attacks will be the newly saved. They lack the spiritual maturity and strength to withstand the assaults on their faith that will come in the form of deceptively alluring lies. And, as a result, they will find themselves being lured back into their old ways of life, marked by slavery to sin rather than freedom in Christ.

…when people escape from the wickedness of the world by knowing our Lord and Savior Jesus Christ and then get tangled up and enslaved by sin again, they are worse off than before. – 2 Peter 2:20 NLT

Peter used two old and probably well-known proverbs to describe such people.

“The dog returns to its own vomit, and the sow, after washing herself, returns to wallow in the mire.” – 2 Peter 2:22 ESV

These two visual metaphors were meant to be vivid reminders of the unacceptable nature of spiritual apostasy. Peter wanted his readers to be appalled at the thought of falling away from the faith. He compared it to a dog eating its own vomit – a thoroughly disgusting image that was meant to illustrate just how unacceptable it was for a believer to become enslaved by sin again.

The author of Hebrews describes how difficult it can be for a fallen believer to return once again to faith. It is not impossible, but it is highly improbable.

For it is impossible to bring back to repentance those who were once enlightened—those who have experienced the good things of heaven and shared in the Holy Spirit, who have tasted the goodness of the word of God and the power of the age to come— and who then turn away from God. It is impossible to bring such people back to repentance; by rejecting the Son of God, they themselves are nailing him to the cross once again and holding him up to public shame. – Hebrews 6:4-6 NLT

Peter and James are not suggesting that believers who are enticed to return to their old sinful ways have lost their salvation. But they are clearly stating that it is possible for an immature Christ-follower to be lured back into their pre-conversion state of slavery to sin. The potential for “backsliding” was an ever-present reality for every follower of Christ, and this is why the apostles so strongly promoted the need for ongoing sanctification.

So put to death the sinful, earthly things lurking within you. Have nothing to do with sexual immorality, impurity, lust, and evil desires. Don’t be greedy, for a greedy person is an idolater, worshiping the things of this world. Because of these sins, the anger of God is coming. You used to do these things when your life was still part of this world. But now is the time to get rid of anger, rage, malicious behavior, slander, and dirty language. Don’t lie to each other, for you have stripped off your old sinful nature and all its wicked deeds. Put on your new nature, and be renewed as you learn to know your Creator and become like him. – Colossians 3:5-10 NLT

Failure to put off the old and put on the new would eventually result in spiritual regression, not spiritual transformation. It would be like a cleanly washed sow returning to the mud and the mire. Unaccustomed to the value of cleanliness, a pig will return to its old familiar and comfortable habits. It’s only natural. And the same thing is true of a believer who fails to supplement his faith with moral excellence, knowledge, self-control, patient endurance, godliness, brotherly affection, and love (2 Peter 1:5-7).

There is no place for complacency in the life of a believer. The Christian life is not intended to be static or stagnant. Growth is expected and intended as a sign of spiritual health and well-being. The presence of the Holy Spirit within the life of a believer is intended to result in heart transformation that produces behavior modification. But the believer who fails to make progress will eventually regress. The constant presence of their old sin nature will lead them to return to the “vomit” of their former life. And though cleansed by the blood of Jesus Christ, they will find themselves covered in the muck and mire of sin once again.

All of this is why Peter makes such a big deal out of the false teachers. He knows they will find a ready and willing audience, and he also knows that some within the congregations to whom he was writing would follow the way of the dog and the pig. So, as he opens up the next section of his letter, he reminds his readers that this is the second time he has had to write them. In his former letter, he spent a great deal of time teaching them about the difference between their current suffering and their future inheritance. He knew that they were undergoing difficult trials because of their faith in Christ. But he also knew that they could live with great expectation because they had “a priceless inheritance—an inheritance that is kept in heaven for you, pure and undefiled, beyond the reach of change and decay” (1 Peter1:4 NLT).

Peter had wanted them to know that, despite all that was happening to them in this life, they could rejoice because God had something incredible in store for them in the next life.

So be truly glad. There is wonderful joy ahead, even though you must endure many trials for a little while. These trials will show that your faith is genuine. It is being tested as fire tests and purifies gold—though your faith is far more precious than mere gold. So when your faith remains strong through many trials, it will bring you much praise and glory and honor on the day when Jesus Christ is revealed to the whole world. – 1 Peter 1:6-7 NLT

And Peter had told them that the prophets of written about this coming salvation, even though they couldn’t fully comprehend its meaning or significance.

They wondered what time or situation the Spirit of Christ within them was talking about when he told them in advance about Christ’s suffering and his great glory afterward. – 1 Peter 1:11 NLT

But their inability to understand the scope of God’s promises did nothing to invalidate the reliability of God’s word. Those men had written under the inspiration of God’s Spirit, declaring the truth concerning God’s redemptive plan – a plan that included the glorious inheritance to which Peter had referred in his first letter. That’s why Peter wrote in his second letter: “I want you to remember what the holy prophets said long ago and what our Lord and Savior commanded through your apostles” (2 Peter 3:2 NLT). He was taking them back to those promises penned by the prophets and then declared by him and his fellow apostles. Peter and his companions had come to understand that Jesus was the fulfillment of the Old Testament prophecies concerning the Messiah and that there was far more to His kingship than a temporal reign in the city of David. Jesus had come to do something far more spectacular than return Israel to power and prominence. He had come to redeem fallen mankind and to one day restore all creation to its former glory. 

And yet, there were false teachers who were questioning the truth of God’s Word as proclaimed by the prophets and contradicting the teachings the apostles had received from Christ Himself. Peter continued to warn that “in the last days scoffers will come, mocking the truth and following their own desires” (2 Peter 3:3 NLT). And he provided a specific example of how they will question the writings of the prophets and the words of the apostles. They will say:

“What happened to the promise that Jesus is coming again? From before the times of our ancestors, everything has remained the same since the world was first created.” – 2 Peter 3:4 NLT

Notice the subtlety of their line of questioning. The apostles had been teaching that the writings of the Old Testament prophets had clearly proclaimed the second coming of Jesus. But these false teachers were arguing that everything remained just as it was when those men had penned their words. Nothing had changed. Jesus had not returned and, by inference, they were suggesting that He never would. The false teachers were propagating a form of deism. They believed that God existed but that He did not involve Himself in the daily affairs of man. In their estimation, Jesus had been nothing more than a godly man whose good life could be emulated. But He had not been God in human flesh who sacrificed His life for sinful mankind.

In essence, the false teachers were accusing the apostles of lying and twisting the words of the prophets. They were suggesting that Peter and his companions had fabricated the whole God-in-human-flesh idea and had made up the story of Jesus’ resurrection. These arrogant men were denying the teachings of the apostles but, more than that, they were calling into question the veracity of God’s Word. Peter boldly declares:

They deliberately forget that God made the heavens long ago by the word of his command, and he brought the earth out from the water and surrounded it with water. Then he used the water to destroy the ancient world with a mighty flood. – 2 Peter 3:5-6 NLT

Whether they believed it or not, God had intervened in the affairs of the world before, and He would do so again. While the false teachers would go on questioning divine intervention and future judgment, it did nothing to alter the reality of either one – a point that Peter made perfectly clear.

…by the same word, the present heavens and earth have been stored up for fire. They are being kept for the day of judgment, when ungodly people will be destroyed. – 2 Peter 3:7 NLT

Just because they had not yet witnessed the second coming of Jesus did not mean it was a figment of the apostles’ imaginations. It was easy for them to point out that Jesus had not yet returned. But Peter attempted to keep their focus on the promises of God. If God said it, He could be trusted to do it. It didn’t matter whether these men believed God or not. God was not hindered by their lack of faith. He was in no way hampered by their doubts about His sovereignty and providential power. God had judged the world before and He would do so again. And, according to Peter, the false teachers were “being kept for the day of judgment, when ungodly people will be destroyed” (2 Peter 3:7 NLT).

English Standard Version (ESV) The Holy Bible, English Standard Version. ESV® Permanent Text Edition® (2016). Copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.