Because the day of the Lord is still coming, believers must respond to the delay with faithful diligence, not carelessness. Peter calls them to be ready for Christ’s return, to understand His delay as mercy that gives time for salvation, to guard against false teachers who twist Scripture to their own destruction, and to keep growing in Christ.

Peter closes this letter by drawing a practical conclusion from everything he has said about the coming day of God and the promise of the new heavens and new earth. Since believers are waiting for these things, they must not become passive. They are to make every effort to be found by Christ in peace, without spot and without blemish.

Here, “peace” does not mainly refer to an inward sense of calm. It points to being in a right and unhindered condition before Christ when He appears. That is why Peter immediately adds “without spot and without blemish.” He is speaking of moral integrity and readiness for the Lord’s evaluation. Present conduct matters, because it will be brought into the light on that day.

Peter also tells his readers how to understand the Lord’s apparent delay. They must not take it as a failure of God’s promise or as evidence that judgment will never come. The Lord’s patience means salvation. His delay is mercy, giving opportunity for repentance and rescue before judgment falls.

To support this, Peter mentions Paul. He says that Paul also wrote about these matters according to the wisdom given to him. Peter is appealing to Paul as a confirming witness. At the same time, he acknowledges that some things in Paul’s letters are hard to understand. He does not mean they are impossible to understand, or that Scripture is unclear by nature. The main problem is not difficulty itself, but the way ignorant and unstable people twist these passages.

The word “twist” is strong. It means to wrench something out of shape. These people are not making innocent mistakes. They are distorting Scripture in a destructive way. Peter says they do this not only with Paul’s letters, but also with the rest of the Scriptures, which in this context shows the scriptural authority of Paul’s writings. And they do this to their own destruction.

That is why Peter gives a direct warning in verse 17. Since his readers have been warned beforehand, they must stay on guard. Vigilance is necessary so that they are not carried away by the error of lawless people and fall from their own steadfastness. Peter presents this as a real danger, not an empty warning.

Peter also makes clear that false doctrine and false living belong together. The men he warns about are not merely mistaken thinkers. They are lawless and unstable. In this passage, corrupt interpretation is joined to corrupt character. Twisting Scripture is not treated as a harmless academic mistake. It is morally charged and spiritually ruinous.

Verse 18 gives the positive answer to the danger described in verses 15–17. The way not to be carried away is not merely to remember that you once stood firm. It is to keep growing. Believers must grow in the grace and knowledge of our Lord and Savior Jesus Christ. This is the opposite of drift and instability. Peter is calling for steady maturity in relation to Christ.

So the final contrast in this paragraph is clear. Do not be led astray and fall; instead, grow. Do not treat the delay of Christ’s coming as an excuse for drift; treat it as mercy. Do not let difficult texts become an opening for distortion; handle them with humility and steadiness. And do not separate readiness for Christ’s return from holy living and doctrinal vigilance. Peter holds them together.

The letter ends with praise to Jesus Christ. The One who will come, judge, and save is worthy of glory now and forever.